@article{Kohler1999,
author = {Kohler, H.P. and Rodgers, J.L. and Christensen, K.},
title= {Is fertility behaviour in our genes? Findings from a Danish twin study},
year = {1999},
doi = {10.1111/j.1728-4457.1999.00253.x},
journal = {Population and Development Review},
volume = {25},
pages = {253--288},
}