TY  - CHAP
A1  - Gérard, H.
T1  - Theory building in demography
Y1  - 2006
A3  - Caselli, G.
A3  - Vallin, J.
A3  - Wunsch, G.
T2  - Demography. Analysis and Synthesis
CY  - San Diego
PB  - Academic Press
SP  - 647
EP  - -660

ER  -