TY  - RPRT
TI  - Functional definition and design of a USDA system
AU  - Evans, S. M.
AU  - Dario, E. R.
AU  - Dickinson, G. L.
PY  - 1979
UR  - https://ntrs.nasa.gov/citations/19800007261
ID  - 19800007261
ER  -