@inbook{Bengtsson2010,
author = {Bengtsson, T.},
title= {Introduction},
year = {2010},
doi = {10.1007/978-3-642-12612-3_1},
editor = {Bengtsson, T.},
booktitle = {Population ageing - A threat to the welfare state?},
address = {Berlin, Heidelberg},
publisher = {Springer},
pages = {1--6},
}