@article{Guinnane1994,
author = {Guinnane, T.W. and Okun, B.S. and Trussell, J.},
title= {What do we know about the timing of fertility transitions in Europe?},
year = {1994},
doi = {10.2307/2061905},
volume = {31},
number = {2},
pages = {1--20},
}