@inbook{Willekens1982,
author = {Willekens, F.},
title= {Multidimensional population analysis with incomplete data},
year = {1982},
editor = {Land, K.C.},
editor = {Rogers, A. },
booktitle = {Multidimensional Mathematical Demography},
address = {New York},
publisher = {Academic Press},
pages = {43--111},
}