TY  - CHAP
A1  - Cassell, P.-G. 
T1  - Changing seasonality of births in Sweden 1900-1999
Y1  - 2002
A3  - Carling, J.
T2  - Nordic Demography: Trends and Differentials. Scandinavian Population Studies
CY  - Oslo
PB  - Unipub forlag/Nordic Demographic Society

ER  -