@article{Skopek2017,
author = {Skopek, J. and Leopold, T.},
title= {Who becomes a grandparent – and when? Educational differences in the chances and timing of grandparenthood},
year = {2017},
doi = {10.4054/DemRes.2017.37.29},
volume = {37},
number = {29},
pages = {917--928},
}