TY - RPRT TI - A Time-Regularized Multiple Gravity-Assist Low-Thrust Bounded-Impulse Model for Trajectory Optimization AU - Ellison, Donald H. AU - Englander, Jacob A. AU - Conway, Bruce A. PY - 2017 UR - https://ntrs.nasa.gov/citations/20170001426 ID - 20170001426 ER -