TY  - BOOK
AU  - Smith,David
AU  - Keyfitz,Nathan
TI  - Mathematical demography 
SN  - 3540078991
U1  - 519 SMI  
PY  - 1977///.
CY  - New York : 
PB  - Springer-Verlag, 
KW  - Branching theory
KW  - Probability models
N1  - Includes author, subject index and bibliographical reference.
ER  -