Conference and Journal Papers

  1. Akhavan-Tafti, Szabo, A., M., Johnson, L., Slavin, J. A., Pulkkinen, T., Fontaine, D., Lepri, S., Kilpua, E., Manchester, W., Sood, R., Leon, O., Ala-Lahti, M., Sachdeva, N., Soni, S., Wilson, L., and Jian, L., “Space Weather Investigation Frontier (SWIFT): Distinguishing between Local and Global Processes Driving Space Weather,” In European Geophysics Union, EGU25, Vienna, Austria, April, 2025 (submitted).
  2. Loshelder, G., Sood, R., and Su, W., 2025, January. Orbit Determination Using Physics-Informed Neural Networks. In AIAA SCITECH 2025 Forum, Orlando, FL (1931). DOI: 10.2514/6.2025-1931.
  3. Houin, A., and Sood, R., “Optimal Outbound Transfer Windows for Artemis III and Beyond,” Astrodynamics, 2024 (accepted).
  4. Sikes, J. D., Pezent, J. B., Sood, R., and Akhavan-Tafti, M., 2024, December. Application of Signed Distance Fields to Spacecraft Constellation Trajectory Design. AIAA Journal of Guidance, Control, and Dynamics. DOI: 10.2514/1.G008340.
  5. Akhavan-Tafti, M., Szabo, A., Johnson, L., Slavin, J. A., Pulkkinen, T., Kilpua, K., Lepri, S., Fontaine, D., Manchester, W., Jian, L., Wilson, L., Sood, R., Leon, O., Sachdeva, N., Ala-Lahti, M., Soni, S. L., and Atilaw, T., “SWIFT: Determining 3D Characteristics and Evolution of Small- to Meso-Scale Solar Wind Structures at Sub-L1,” In 2024 American Geophysical Union (AGU24), SH11F-2853, New Orleans, LA, Dec. 2024.
  6. Houin, A., and Sood, R., 2024, October. Cislunar Trajectory Design and Maneuver Autonomy for NASA’s Moon to Mars Architecture. In 75th International Astronautical Congress, IAC Milano, Italy (IAC–24,C1,7,4,x83115).
  7. Johnson, L., Akhavan-Tafti, M., Sood, R., Szabo, A., and Thomas, H. D., 2024, October. Space Weather Investigation Frontier (SWIFT) Mission Concept: Continuous Distributed Observations of Geo-Effective, Heliospheric Structures from the Vantage Points of Sun-Earth L1 and Sub-L1. In 75th International Astronautical Congress, IAC Milano, Italy (IAC-24-B4.7.1.x81519).
  8. Sandel C., and Sood, R., 2024, August. Reachability Study of Low-Thrust CubeSat Transfers from Gateway to Sun-Earth Orbits. In 2024 AAS/AIAA Astrodynamics Specialist Conference (24-393), Broomfield, CO.
  9. Blumenthal, B., and Sood, R., 2024, August. Finite Maneuver Gateway-CubeSat Range and Recontact Analysis Using Stretching Directions. In 2024 AAS/AIAA Astrodynamics Specialist Conference (24-475), Broomfield, CO.
  10. Aguilar, A. R., McCarthy, B. P., and Sood, R., 2024, August. Transfer Strategies for Long-Term Loitering in the Vicinity of Near Rectilinear Halo Orbits. In 2024 AAS/AIAA Astrodynamics Specialist Conference (24-386), Broomfield, CO.
  11. Pezent, J. B., Sood, R., Heaton, A., and Johnson, L., 2024, May. “Solar Polar Imaging Mission Design Leveraging Venus Flybys. The Journal of Spacecraft and Rockets. DOI: 10.2514/1.A35963​.
  12. Sandel C., and Sood, R., 2024, May. “Natural and Forced Spacecraft Loitering in a Near Rectilinear Halo Orbit,” The Journal of the Astronautical Sciences. DOI: 10.1007/s40295-024-00446-7.
  13. Elkins, J. G., Fahimi, F., and Sood, R., 2024, March. “Stable Online Learning-Based Adaptive Control of Spacecraft and Quadcopters,” 2024 IEEE Aerospace Conference, 10.0605, Big Sky, MT. Track 10 (Software and Computing) Best Paper Award.
  14. Houin, A., Tyler, D., and Sood, R., 2024, February. “Roll Torque Mitigating Trajectories for Multi-Body Solar Sail Orbits,” 46th Annual AAS Guidance and Control Conference, AAS 24-P17, Breckenridge, CO.
  15. Sikes, J. D., Pezent, J. B., Rubinsztejn, A., Sood, R., Everett, J., and Heaton, A., 2024. “Off-nominal transfer analysis for NASA’s solar cruiser mission. Acta Astronautica. DOI: 10.1016/j.actaastro.2023.10.003.
  16. Akhavan-Tafti, M., Johnson, L., Szabo, A., Lario, D., Le, G., Wilson, L., Jian, L., Biesecker, D., Slavin, J. A., Pulkkinen, T., Lepri, S., Manchester, W., Sood, R., Fontaine, D., Kilpua, E., Leon, O., Sachdeva, N., Atilaw, T., Ala-Lahti, M., and Soni, S. L., “Space Weather Investigation Frontier (SWIFT): Multi-Spacecraft Mission to Resolve Heliospheric Structures,” 2023 American Geophysical Union (AGU23), SH34A-09, San Francisco, CA, Dec. 2023. 
  17. Noll, M, Akhavan-Tafti, M., and Sood, R., “Multi-spacecraft Trajectory Design and Orbit Optimization for Space Weather Investigation Frontier (SWIFT),” 2023 American Geophysical Union (AGU23) SH21D-2907, San Francisco, CA, Dec. 2023. 
  18. Blumenthal, B., and Sood, R., 2023. Local Lyapunov Exponent Augmented Differential Corrections Process for Cislunar Trajectory Targeting. The Journal of the Astronautical Sciences. DOI: 10.1007/s40295-023-00396-6.
  19. Sikes, J. D., Pezent, J. B., and Sood, R., 2023, August. Applications of Signed Distance Fields to Spacecraft Trajectory Design. In 2023 AAS/AIAA Astrodynamics Specialist Conference (23-233), Big Sky, MT.
  20. Pezent, J.B., Sikes, J.D., Sood, R., Howell, K.C., and Stuart, J., 2023, August. Enhancements to the Astrodynamics Software and Science Enabling Toolkit (ASSET). In 2023 AAS/AIAA Astrodynamics Specialist Conference (23-326), Big Sky, MT.
  21. Akhavan-Tafti, M., Johnson, L., Sood, R., Slavin, J. A., Pulkkinen, T., Lepri, S. Kilpua, E., Fontaine, D., Szabo, A., Wilson, L., Le, G., Atilaw, T., Ala-Lahti, M., Soni, S. L., Biesecker, D., Jian, L., and Lario, D.,​ 2023. Space weather investigation Frontier (SWIFT). Frontiers in Astronomy and Space Sciences. DOI: 10.3389/fspas.2023.1185603.
  22. Blumenthal, B., and Sood, R., 2023, January. Application of Local Lyapunov Exponents for NASA’s Artemis-1 Trajectory Design and Maneuver Planning. In 33rd AAS/AIAA Space Flight Mechanics Meeting, AAS 23- 182, Austin, TX.
  23. Sandel C., and Sood, R., 2023, January. Low-Thrust Rendezvous and Proximity Operations in a Near Rectilinear Halo Orbit. In 33rd AAS/AIAA Space Flight Mechanics Meeting, AAS 23-296, Austin, TX.
  24. Pezent, J. B., Sood, R., Heaton, A., and Johnson, L., 2023, January. “Mission Design for Near-Future Solar Polar Imaging Mission Leveraging Venus Flyby. In 33rd AAS/AIAA Space Flight Mechanics Meeting, AAS 23- 284, Austin, TX.
  25. Sikes, J. D., Rubinsztejn, A., Sood, R., Everett, J., and Heaton, A., 2023, January. “Overburn and Underburn Analysis for NASA’s Solar Cruiser Mission. In 33rd AAS/AIAA Space Flight Mechanics Meeting, AAS 23-283, Austin, TX.
  26. Blumenthal, B., and Sood, R., 2023, January. “Application of Local Lyapunov Exponents for Autonomous Trajectory Targeting and Generation. In 33rd AAS/AIAA Space Flight Mechanics Meeting, AAS 23-183, Austin, TX.
  27. Sikes, J.D., Pezent, J.B., Sandel, C. G., ​Rubinsztejn, A., and Sood, R., 2023. GTOC-11: Results from the University of Alabama. Special Issue Acta Astronautica. DOI: 10.1016/j.actaastro.2022.06.038.
  28. Pezent, J.B., and Sood, R., 2022. New Solution to Euler’s Equations for Asymmetric Bodies: Applications to Spacecraft Reorientation. AIAA Journal of Guidance, Control, and Dynamics. DOI: 10.2514/1.G006747.
  29. Houin, A., and Sood, R., 2022, September.  Optimal Launch Windows for Artemis III and Beyond Leveraging Contour Maps. In 73rd International Astronautical Congress, IAC Paris, France (IAC-22-C1.IP.35).
  30. Rubinsztejn, A., Sood, R., and Laipert, F. E., 2022, August. Designing Multiple Missed Thrust Event Resilient Trajectories using Virtual Swarms. In 2022 AAS/AIAA Astrodynamics Specialist Conference (22-679).79
  31. McCoun, N., and Sood, R., 2022, February. Effects of Terrain on Satellite-Based Position Accuracy For Stationary and Moving Targets. In 44th Annual AAS Guidance and Control Conference (p. 204).
  32. Pezent, J.B., Sikes, J.D., Ledbetter, W.G., Sood, R., Howell, K.C., and Stuart, J., 2022, January. ASSET: Astrodynamics Software and Science Enabling Toolkit. In 32nd AIAA/AAS Space Flight Mechanics Meeting (p. 1131). DOI: https://doi.org/10.2514/6.2022-1131.
  33. ​Rubinsztejn, A., and Sood, R., 2022, January. Chaining Moon-to-Moon Trajectories Using Network Analysis. In 32nd AIAA/AAS Space Flight Mechanics Meeting (p. 0858). DOI: https://doi.org/10.2514/6.2022-0858.​
  34. Elkins, J., Sood, R., and Rumpf, C., 2022. Bridging Reinforcement Learning and Online Learning for Spacecraft Attitude Control. AIAA Journal of Aerospace Information Systems.DOI: https://doi.org/10.2514/1.I010958​.
  35. Rubinsztejn, A., Sandel, C. G., Pezent, J. B., Sood, R., Laipert, F. E., Heaton, A, and Johnson, L., 2021, August. Design of Solar Sailing Trajectories Resilient to Safe Mode Events. In 2021 AAS/AIAA Astrodynamics Specialist Conference (p. 621).
  36. Rubinsztejn, A., Sandel, C. G., Sood, R., and Laipert, F. E., 2021, August. Designing Trajectories Resilient to Missed Thrust Events Using Expected Thrust Fraction. Aerospace Science and Technology, DOI: https://doi.org/10.1016/j.ast.2021.106780.
  37. Pezent, J.B., Sood, R., Heaton, A., Miller, K., and Johnson, L., 2021, June. Preliminary Trajectory Design for NASA’s Solar Cruiser: A Technology Demonstration Mission. Acta Astronautica, DOI: https://doi.org/10.1016/j.actaastro.2021.03.006.
  38. Rubinsztejn, A., Sood, R., and Laipert, F. E., 2021, June. Measuring Resilience of Autonomous Controllers to Spacecraft Missed Thrust Events. In 11th International ESA Conference on Guidance, Navigation & Control Systems.
  39. Keane, J., Sood, R. et al., 2021 March. The Science Case for Io Exploration. Bulletin of the American Astronautical Society, 53(4), 178, DOI: https://www.doi.org/10.3847/25c2cfeb.f844ca0e​.
  40. Keane, J., Sood, R. et al., 2021 March. Recommendations for Addressing Priority Science in the Next Decade. Bulletin of the American Astronautical Society, 53(4), 179, DOI: https://www.doi.org/10.3847/25c2cfeb.3de45b59​.
  41. Ledbetter, W.G., Sood, R., Keane, J.T., and Stuart, J., 2021, February. SmallSat Swarm Gravimetry: Revealing the Interior Structure of Asteroids and Comets. Astrodynamics, DOI: https://doi.org/10.1007/s42064-020-0098-1.
  42. Rubinsztejn, A., Sood, R., and Laipert, F. E., 2021, February. Expected Thrust Fraction: Resilient Trajectory Design Applied to the Earth Return Orbiter. In 31st AAS/AIAA Space Flight Mechanics Meeting (p. 232).
  43. Song, P., Gogineni, S., Galkin, I.A., Volakis, J., Soderblom, J.M., Hayes, A.G., Reinisch, B.W., Giles, R.H., Sood, R., Zhang, H.L. Braaten, D., Melosh, H.J., Bruzzone, L., Venketakrishnan, S.B., Yan, J.B., O’Neil, C.R., 2021, January. Feasibility Study of a High‐Resolution Shallow Surface Penetration Radar for Space Application. Radio Science, DOI: https://doi.org/10.1029/2020RS007118.
  44. Pezent, J.B., Sood, R. and Heaton, A., 2020, October. Configuration Space and Stability Analysis of Solar Sail Near-Vertical Earth-Trailing Orbits. Advances in Space Research, DOI: https://doi.org/10.1016/j.asr.2020.10.011.
  45. Elkins, J., Sood, R., and Rumpf, C., 2020, October. Autonomous Spacecraft Attitude Control Using Deep Reinforcement Learning. In 71st International Astronautical Congress, IAC 2020 The CyberSpace Edition (IAC-20-C1.9.8).
  46. Pezent, J.B., Sood, R., and Heaton, A., 2020, August. Preliminary Trajectory Design for NASA’s Solar Cruiser: A Technology Demonstration Mission. In AAS/AIAA Astrodynamics Specialist Conference (p. 653).
  47. Elkins, J., Sood, R., and Rumpf, C., 2020, August. Adaptive Continuous Control of Spacecraft Attitude Using Deep Reinforcement Learning. In AAS/AIAA Astrodynamics Specialist Conference (p. 475).
  48. Rubinsztejn, A., Sandel, C. G., Sood, R., and Laipert, F. E., 2020, August. Designing Trajectories Resilient to Missed Thrust Events Using Expected Thrust Fraction. In AAS/AIAA Astrodynamics Specialist Conference (p. 452).
  49. Schoenwetter, L., Sood, R., and Barbee, B.W., 2020, August. Optimal Pursuit of Evasive Spacecraft. In AAS/AIAA Astrodynamics Specialist Conference (p. 540).
  50. Heaton, A., and Sood, R., 2020, August., Space Launch System Departure Trajectory Analysis for Cislunar and Deep-Space Exploration. In AAS/AIAA Astrodynamics Specialist Conference (p. 604).
  51. Sikes, J.D., Ledbetter, W., Sood, R., Medina, K., and Turse, D., 2020, August. Keeping Low Earth Orbit Clean: Deorbit Analysis for an Articulating Boom Drag Sail. In AAS/AIAA Astrodynamics Specialist Conference (p. 629).
  52. Rubinsztejn, A., Bryan, K., Sood, R., and Laipert, F. E., 2020, August. Using Reinforcement Learning to Design Missed Thrust Resilient Trajectories. In AAS/AIAA Astrodynamics Specialist Conference (p. 453).
  53. Pezent, J.B., Sood, R., and Heaton, A., 2020, June. Innovative Solar Sail Earth-Trailing Trajectories Enabling Sustainable Heliophysics Missions, The Journal of the Astronautical Sciences, DOI: https://doi.org/10.1007/s40295-020-00214-3.
  54. Rubinsztejn, A., Sood, R., and Laipert, F.E., 2020, May. Neural Network Optimal Control in Astrodynamics: Application to the Missed Thrust Problem, Acta Astronautica, DOI: ​https://doi.org/10.1016/j.actaastro.2020.05.027.
  55. Pezent, J.B., Sood, R. and Heaton, A., 2020, February. Contingency Target Assessment, Trajectory Design, and Analysis for NASA’s NEA Scout Solar Sail Mission, Advances in Space Research, no. 14643, DOI: https://doi.org/10.1016/j.asr.2020.02.004.
  56. Rubinsztejn, A., Sood, R., and Laipert, F.E., 2019, August. Neural Network Based Optimal Control: Resilience to Missed Thrust Events for Long Duration Transfers. In AAS/AIAA Astrodynamics Specialist Conference (p. 773). 
  57. Pezent, J.B., Sood, R., and Heaton, A., 2019, August. Solar Sail Enabled Near-Vertical Earth-Trailing Orbits​. In 5th International Symposium on Solar Sailing (19049). 
  58. Pezent, J.B., Sood, R., and Heaton, A., 2019, July. Contingency Target Assessment, Trajectory Design, and Analysis for NASA’s NEA Scout Solar Sail Mission. In 5th International Symposium on Solar Sailing (19050). 
  59. Pezent, J.B., Sood, R., and Heaton, A., 2019, June. High-fidelity contingency trajectory design and analysis for NASA’s near-Earth asteroid (NEA) scout solar sail mission, Acta Astronautica, vol. 159, pp 385-396, DOI: https://doi.org/10.1016/j.actaastro.2019.03.050.
  60. Kaku, T., Haruyama, J., Miyake, W., Kumamoto, A., Ishiyama, K., Nishibori, T., Iwata, T., Crites, S. T., Michikami, T., Yokota, Y., Ohno, T., Sood, R., Melosh, H. J., Chappaz, L., and Howell, K. C., 2019, March. Global Distribution of Possible Lava Tubes from Near-Surface to a Hundred Meter Depth on the Moon. In Lunar and Planetary Science Conference (Vol. 50). poster
  61. Sood, R., and Howell, K., 2019, February. Solar Sail Transfers and Trajectory Design to Sun-Earth L4, L5: Solar Observations and Potential Earth Trojan Exploration, The Journal of the Astronautical Sciences, pp.1-35, DOI: https://doi.org/10.1007/s40295-018-00141-4.
  62. Pezent, J., Heaton, A., and Sood, R., 2019, January. Innovative Solar Sail Earth-Trailing Trajectories Enabling Sustainable Heliophsyics Missions. In 29th AAS/AIAA Space Flight Mechanics Meeting (p. 541).
  63. Ledbetter, W.G., Sood, R., and Stuart, J., 2019, January. Expected Accuracy of Density Recovery using Satellite Swarm Gravity Measurements. In 29th AAS/AIAA Space Flight Mechanics Meeting (p. 529). 
  64. ​Guzzetti, D., Sood, R., Chappaz, L., and Baoyin, H., 2019, January. Stationkeeping Analysis for Solar Sailing the L4 Region of Binary Asteroid Systems. Journal of Guidance, Control, and Dynamics, 1–13, DOI: https://doi.org/10.2514/1.G003994.
  65. Ledbetter, W.G., Sood, R., and Keane, J.T., 2018, August. SmallSat Swarm Gravimetry: Revealing the Interior Structure of Asteroids and Comets. In AAS/AIAA Astrodynamics Specialist Conference (p. 225). 
  66. Ullery, D.C., Soleymani, S., Heaton, A., Orphee, J., Johnson, L., Sood, R., Kung, P. and Kim, S.M., 2018. Strong Solar Radiation Forces from Anomalously Reflecting Metasurfaces for Solar Sail Attitude Control. Scientific reports, 8(1), p.10026, DOI: https://doi.org/10.1038/s41598-018-28133-2. 
  67. Gogineni, P., Simpson, C. R., Yan, J., O’Neill, C. R., Sood, R., Gurbuz, S. Z., Gurbuz, A. C., 2018, July. A CubeSat Train for Radar Sounding and Imaging of Antarctic Ice Sheet. InIGARSS 2018 – 2018 IEEE International Geoscience and Remote Sensing Symposium Conference, (p. 4138-4141).
  68. Sood, R., Pezent, J., and Heaton, A., 2018, March. NEA Scout-X: A Cost-Effective Mission Performing Flybys of Multiple Near-Earth Asteroids and Rendezvous. In Lunar and Planetary Science Conference (Vol. 49).
  69. Ledbetter, W.G., Sood, R., and Keane, J.T., 2018, March. The Interior Structure of Asteroids and Comets Revealed by ChipSat Swarm Gravimetry. In Lunar and Planetary Science Conference (Vol. 49). poster
  70. Kaku T., Haruyama J., Miyake W., Kumamoto A., Ishiyama K., Nishibori T., Yamamoto K., Iwata, T., Crites, S. T., Michikami T., Yokota Y., Sood, R., Melosh, H. J., Chappaz, L., Howell K. C., 2018, March. Existence of a Lunar Lava Tube West of Rima Mairan Suggested by SELENE LRS​. In Lunar and Planetary Science Conference (Vol. 49).
  71. Pezent, J.B., Sood, R. and Heaton, A., 2018 January. Near Earth Asteroid (NEA) Scout Solar Sail Contingency Trajectory Design and Analysis. In 28th AIAA/AAS Space Flight Mechanics Meeting (p. 0199), DOI: https://doi.org/10.2514/6.2018-0199.
  72. Kaku T., Haruyama J., Miyake W., Kumamoto A., Ishiyama K., Nishibori T., Yamamoto K., Crites S. T., Michikami T., Yokota Y., Sood R., Melosh, H. J., Chappaz L., Howell K. C., 2017, October. Detection of Intact Lava Tubes at Marius Hills on the Moon by SELENE (Kaguya) Lunar Radar Sounder​. Geophysical Research Letters​, 44, 10,155–10,161, DOI: https://doi.org/10.1002/2017GL074998.
  73. Haruyama J., Kaku T., Shinoda R., Miyake W., Kumamoto A., Ishiyama K., Nishibori T., Yamamoto K., Kurosawa K., Suzuki A.I., Crites S.T., Michikami T., Yokota Y., Sood, R., Melosh, H. J., Chappaz L., Howell K. C.,​ 2017, March. Detection of Lunar Lava Tubes by Lunar Radar Sounder Onboard SELENE (Kaguya). In Lunar and Planetary Science Conference (Vol. 48).
  74. Chappaz, L., Sood, R., Melosh, H.J., Howell, K.C., Blair, D.M., Milbury, C. and Zuber, M.T., 2017. Evidence of large empty lava tubes on the Moon using GRAIL gravity. Geophysical Research Letters, 44(1), pp.105-112, DOI: https://dx.doi.org/10.1002/2016GL071588.
  75. Sood, R., Chappaz, L., Melosh, H.J., Howell, K.C., Milbury, C., Blair, D.M. and Zuber, M.T., 2017. Detection and characterization of buried lunar craters with GRAIL data. Icarus, 289, pp.157-172, DOI: https://doi.org/10.1016/j.icarus.2017.02.013.
  76. Blair, D.M., Chappaz, L., Sood, R., Milbury, C., Bobet, A., Melosh, H.J., Howell, K.C. and Freed, A.M., 2017. The structural stability of lunar lava tubes. Icarus, 282, pp.47-55, DOI: https://doi.org/10.1016/j.icarus.2016.10.008.​
  77. Sood, R. and Howell, K., 2016. L4, L5 Solar Sail Transfers and Trajectory Design: Solar Observations and Potential Earth Trojan Exploration. In 26th AAS/AIAA Space Flight Mechanics Meeting (Vol. 158).
  78. Sood, R., Melosh, H.J. and Howell, K., 2016. Lunar advanced radar orbiter for subsurface sounding (LAROSS): lava tube exploration mission. In 26th AAS/AIAA Space Flight Mechanics Meeting (Vol. 158).
  79. Sood, R., 2016. Significance of specific force models in two applications: Solar sails to sun-earth L 4/L 5 and grail data analysis suggesting lava tubes and buried craters on the moon (Doctoral dissertation, Purdue University).​​
  80. Sood, R., Chappaz, L., Melosh, H.J., Howell, K.C. and Milbury, C., 2016, March. ​​Detection of Buried Empty Lunar Lava Tubes Using GRAIL Gravity Data​. In Lunar and Planetary Science Conference (Vol. 47, p. 1509).
  81. ​Blair, D.M., Chappaz, L., Sood, R., Milbury, C., Bobet, A., Melosh, H.J., Howell, K.C. and Freed, A.M., 2015, March. Determining the structural stability of lunar lava tubes. In 46th Lunar and Planetary Science Conference (Vol. 2174).
  82. Sood, R., Chappaz, L., Melosh, H.J., Howell, K.C., Blair, D.M. and Milbury, C., 2015, October. Detection of Buried Empty Lunar Lava Tubes Using GRAIL Gravity Data. In 2nd International Planetary Caves Conference (Vol. 1883, p. 9016).
  83. Blair, D.M., Chappaz, L., Sood, R., Milbury, C., Bobet, A., Melosh, H.J., Howell, K.C. and Freed, A.M., 2015, October. Modeling the Structural Stability of Lunar Lava Tubes. In 2nd International Planetary Caves Conference (Vol. 1883, p. 9014).
  84. Sood, R., Chappaz, L., Milbury, C., Blair, D.M., Melosh, H.J. and Howell, K.C., 2015, March. Earhart: A Large, Previously Unknown Lunar Nearside Crater Revealed by GRAIL Gradiometry. In Lunar and Planetary Science Conference (Vol. 46, p. 1883).
  85. ​​Chappaz, L., Sood, R., Melosh, H. and Howell, K., 2014. Buried empty lava tube detection with GRAIL data. In AIAA/AAS Astrodynamics Specialist Conference and Exposition.