@inbook{Véron2007,
author = {Véron, J. and Pennec, S. and Légaré, J.},
title= {Introduction},
year = {2007},
editor = {Véron, J.},
editor = {Pennec, S.},
editor = {Légaré, J.},
booktitle = {Ages, generations and the social contract. The demographic challenges facing the welfare state},
address = {Dordrecht, The Netherlands},
publisher = {Springer},
pages = {1--13},
}