@inbook{Coleman2006,
author = {Coleman, D.A.},
title= {Population ageing: an unavoidable future},
year = {2006},
editor = {Pierson, C.},
editor = {Castles, F.G.},
booktitle = {The Welfare State Reader},
address = {Cambridge},
publisher = {Polity Press},
pages = {298--309},
}