@article{Perelli-Harris2010,
author = {Perelli-Harris, B. and Sigle-Rushton, W. and Kreyenfeld, M. and Lappegard, T. and Keizer, R. and Berghammer, C.},
title= {The educational gradient of childbearing within cohabitation in Europe},
year = {2010},
journal = {Population and Development Review },
volume = {36},
pages = {775--801},
}