2022 V. Lopez & D. Thomas, “Proposed metric for complexity assessment using SysML,” Aerospace. October 2022. DOI: https://doi.org/10.3390/aerospace9100612 Grumbach & D. Thomas, “Quantitative Validation of the Principles of Complex System Integration,” Systems Engineering. DOI: 10.1002/sys.21641 S. Rawlins, Y. Kim, & D. Thomas, “Feasibility of Low-Enriched Uranium Fueled Nuclear Thermal Propulsion in the Low-Thrust Region Below 16klbf,” Annals of Nuclear Energy, 179(22), December 2022. DOI: 10.1016/j.anucene.2022.109368. J. Grumbach & D. Thomas,” Systems Integration Implications of Component Reuse” Systems Engineering. DOI: 10.1002/sys.21636. D. Nikitaev & D. Thomas, “Impacts of In-Situ Alternative Propellant Utilization on Mars Vehicle Architectures Using Nuclear Thermal Propulsion,” AIAA Journal of Spacecraft and Rockets. DOI: 10.2514/1.A35399. S. Kumar, D. Thomas, & J. Cassibry, “Decoding the Mission Design Problem for NTP Systems for Outer Planet Robotic Missions,” Nuclear Technology. DOI: 10.1080/00295450.2022.2096388. D. Thomas, M. Houts, W. Walters, K. Hollingsworth, R. Frederick, & J. Cassibry, “Toward the Engineering Feasibility of the Centrifugal Nuclear Thermal Rocket,” Journal of the British Interplanetary Society, 75(5) May 2022, pp. 181-188. D. Nikitaev & D. Thomas, Alternative Propellant NTP Vehicle Architectures, AIAA Journal of Spacecraft and Rockets. https://arc.aiaa.org/doi/10.2514/1.A35289 D. Nikitaev & D. Thomas, “Preliminary Results for In-Situ Alternative Propellants for Nuclear Thermal Propulsion,” Nuclear Technology. S. Kumar, D. Thomas, & J. Cassibry, “Nuclear Thermal Propulsion for Jupiter and Saturn Rendezvous Missions,” AIAA Journal of Spacecraft and Rockets. February 2022. https://arc.aiaa.org/doi/10.2514/1.A35212 2020 J. Grumbach & D. Thomas, "Integration Principles for Complex Systems," Wiley Systems Engineering, SYS-20-018.R2, September 2020. https://doi.org/10.1002/sys.21554 J. Kolligs & D. Thomas, "The Origins and Evolution of Requirements in Engineering," IEEE Systems Journal, June 2020. DOI: 10.1109/JSYST.2020.2999557 Morris, D. Thomas & K. Hollingsworth, “Stay Cool—Alternatives for Long-Term Storage of Large Quantities of Liquid Hydrogen on a Mars Transfer Vehicle,” Nuclear Technology, 2020; 207(6), pp. 860-865. https://www.tandfonline.com/doi/abs/10.1080/00295450.2020.1819157 Hydrogen on a Mars Transfer Vehicle", *Nuclear Technology*, December 2020. https://doi.org/10.1080/00295450.2020.1819157 D. Nikitaev & D. Thomas, "Seeded Hydrogen in Mars Transfer Vehicles Using Nuclear Thermal Propulsion," AIAA Journal of Spacecraft and Rockets, July 2020. https://doi.org/10.2514/1.A34722 D. Nikitaev & D. Thomas, "Seeded Hydrogen in Nuclear Thermal Propulsion Engines," AIAA Journal of Spacecraft and Rockets, April 2020. https://doi.org/10.2514/1.A34711 D. Thomas & E. Patterson, E., Systems Modeling Language viewpoint utilization to facilitate shared mental models among system stakeholders. Systems Research and Behavioral Science, 37(1), 2020, pp.128-140. https://doi.org/10.1002/sres.2610 2019 A. Aueron, D. Thomas, & J. Cassibry, "Analytical Modeling of Radiation Attenuation and Heat Deposition in Propellant for Nuclear Thermal Rockets," AIAA Journal of Spacecraft and Rockets, March 2019. https://doi.org/10.2514/1.A34389