TY  - RPRT
TI  - SIGMA: A Knowledge-Based Simulation Tool Applied to Ecosystem Modeling
AU  - Dungan, Jennifer L.
AU  - Keller, Richard
AU  - Lawless, James G.
PY  - 1994
UR  - https://ntrs.nasa.gov/citations/20010060338
ID  - 20010060338
ER  -