TY  - RPRT
TI  - A trajectory optimization technique based upon the theory of the second variation.
AU  - Kelley, H. J.
AU  - Kopp, R. E.
AU  - Moyer, H. G.
PY  - 1964
UR  - https://ntrs.nasa.gov/citations/19640040321
ID  - 19640040321
ER  -