@article{Dykstra2009c,
author = "Dykstra, P. and Keizer, R.",
title = "The well-being of childless men and fathers in mid-life.",
year = 2009,
journal = "Ageing and Society",
volume = 29,
pages = "1227-1242",
url = "http://repub.eur.nl/res/pub/18075/"
}