TY  - RPRT
TI  - Space transportation - Options and opportunities
AU  - Loftus, J. P., Jr.
AU  - Ried, R. C.
AU  - Bristow, R. B.
PY  - 1988
UR  - https://ntrs.nasa.gov/citations/19890039013
ID  - 19890039013
ER  -