@article{Hofferth2001,
author = {Hofferth, S.L. and Sandberg, J.F.},
title= {Changes in children’s time with parents: United States, 1981–1997},
year = {2001},
doi = {10.1353/dem.2001.0031},
journal = {Demography},
volume = {38},
number = {3},
pages = {423--436},
}