TY  - BOOK
AU  - Roberts, Fred S.
TI  - Discrete mathematical models: with applications to social, biological and environmental problems
SN  - 013214171X
U1  - 511.8024 
PY  - 1976///
CY  - Englewood Cliff, New Jersey
PB  - Prentice-Hall
KW  - Biology--Mathematical models
KW  - Social sciences--Mathematical models
ER  -