TY  - RPRT
TI  - Calculation of free-fall trajectories using numerical optimization methods.
AU  - Hull, D. G.
AU  - Fowler, W. T.
AU  - Gottlieb, R. G.
PY  - 1972
UR  - https://ntrs.nasa.gov/citations/19720050355
ID  - 19720050355
ER  -