@incollection{Vikat2009,
author = "Vikat, A.",
title = "Préface",
year = 2009,
booktitle = "Portraits de familles",
publisher = "Ined, Paris",
volume = Portraits de familles. L’Étude des relations familiales et intergénérationnelles,
pages = "7-10",
url = "http://www.ined.fr/fr/publications/grandes_enquetes/bdd/publication/1492/"
}