TY - RPRT TI - An Expert System-Driven Method for Parametric Trajectory Optimization During Conceptual Design AU - Dees, Patrick D. AU - Zwack, Mathew R. AU - Steffens, Michael AU - Edwards, Stephen AU - Diaz, Manuel J. AU - Holt, James B. PY - 2015 UR - https://ntrs.nasa.gov/citations/20150021408 ID - 20150021408 ER -