TY  - BOOK
AU  - Andersson A E
AU  - Holmberg Ingvar
TI  - Demographic, economic and social interaction
U1  - 304.60151 
PY  - 1977///
CY  - Cambridge
PB  - Ballinger
KW  - Demography-mathematical models
KW  - Emigration and immigration-mathematical models
ER  -