@phdthesis{Sobotka2004,
author = {Sobotka, T.},
title= {Postponement of childbearing and low fertility in Europe},
year = {2004},
URL = {http://dissertations.ub.rug.nl/faculties/rw/2004/t.sobotka/},
type = {Doctoral thesis},
address = {Amsterdam},
publisher = {University of Groningen, Dutch University Press},
}