Justus, C. G.; Aleta Duvall; Vernon W. Keller (November 2003 and February 2004). “Engineering-Level Model Atmospheres For Titan and Mars”. 《International Workshop on Planetary Probe Atmospheric Entry and Descent Trajectory Analysis and Science, Lisbon, Portugal, October 6-9, 2003, Proceedings: ESA SP-544》. ESA. 28 September 2013에 확인함.다음 날짜 값 확인 필요: |date= (도움말)