@article{Kravdal1994,
author = {Kravdal, O.},
title= {The importance of economic activity, economic potential and economic resources for the timing of first births in Norway},
year = {1994},
doi = {10.1080/0032472031000147786},
journal = {Population Studies},
volume = {48},
number = {2},
pages = {249--267},
}