@article{Williams1999,
author = {Williams, L. and Abma, J. and Piccinino, L.J. },
title= {The correspondence between intention to avoid childbearing and subsequent fertility: A prospective analysis},
year = {1999},
doi = {10.2307/2991569},
journal = {Demography},
volume = {31},
number = {5},
pages = {220--227},
}