@inbook{Van Poppel2006,
author = {Van Poppel, F. and Derosas, R.},
title= {Introduction},
year = {2006},
doi = {10.1007/1-4020-5190-5_1},
editor = {Derosas, R.},
editor = {Van Poppel, F. },
booktitle = {Religion and the decline of fertility in the Western world},
address = {New York},
publisher = {Springer},
pages = {1--20},
}