Rohrschneider, R.; Olds, J.R.; Braun, R.; Hutchinson, V.; Kuhl, C.; and Steffes, S.; "Modeling Approach for Analysis and Optimization of a Long-Duration Mars Airplane," AIAA 2004-4313, AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, Albany, NY, August 2004.