TY  - RPRT
TI  - Technology requirements for advanced earth-orbital transportation systems
AU  - Haefeli, R. C.
AU  - Littler, E. G.
AU  - Hurley, J. B.
AU  - Winter, M. G.
PY  - 1977
UR  - https://ntrs.nasa.gov/citations/19780003243
ID  - 19780003243
ER  -