TY  - JOUR
A1  - Willekens, F.
T1  - Modelling approaches to the indirect estimation of migration flows: From entropy to EM
Y1  - 1999
DO  - 10.1080/08898489909525459
JF  - Mathematical Population Studies: An International Journal of Mathematical Demography
VL  - 7
IS  - 3

ER  -