@article{Koops2021,
author = {Koops, J.C. and Liefbroer, A.C. and Gauthier, A.H.},
title= {Socio-economic differences in the prevalence of single motherhood in North America and Europe},
year = {2021},
doi = {10.1007/s10680-021-09591-3},
volume = {37},
number = {4–5},
pages = {825--849},
}