@article{Dunson2002,
author = {Dunson, David  and Colombo, Bernardo and Baird, Donna D.},
title= {Changes with age in the level and duration of fertility in the menstrual cycle},
year = {2002},
doi = {10.1093/humrep/17.5.1399},
journal = {Human Reproduction},
volume = {17},
number = {5},
pages = {1399--1403},
}