@techreport{Willaert2008,
author = {Willaert, D. and Deboosere, P.},
title= {Codeboek Volkstelling 1/3/1981},
year = {2008},
publisher = {Vrije Universiteit Brussel},
address = {Brussel},
number = {Interface Demography Working Paper 2008-4},
}