TY  - BOOK
AU  - Levins,Richard
TI  - Evolution in changing environments: some theoretical explorations 
T2  - Monographs in population biology
PY  - 1968///
CY  - Princeton, N. J.
PB  - Princeton University Press
KW  - Animal populations
KW  - Population genetics
KW  - Evolution
KW  - Ecology
ER  -