@article{Christensen1998,
author = {Christensen, K. and Basso, O. and Kyvik, K.O. and Juul, S. and Boldsen, J. and Vaupel, J.W. and Olsen, J.},
title= {Fecundability of female twins},
year = {1998},
doi = {10.1097/00001648-199803000-00015},
volume = {9},
number = {2},
pages = {189--192},
}