@article{Lesthaeghe2020,
author = {Lesthaeghe, R.},
title= {The second demographic transition, 1986–2020: Sub-replacement fertility and rising cohabitation—a global update},
year = {2020},
doi = {10.1186/s41118-020-00077-4},
volume = {76},
number = {1},
pages = {1--38},
}