@article{Jacobsen1999,
author = {Jacobsen, R. and Møller, H.  and Engholm, G.},
title= {Fertility rates in Denmark in relation to the sexes of preceding children in the family},
year = {1999},
doi = {10.1093/humrep/14.4.1127},
journal = {Human Reproduction,},
volume = {14},
number = {4},
pages = {1127--1130},
}