@inbook{Imhof2003,
author = {Imhof, E.v.},
title= {Cohort analysis},
year = {2003},
editor = {Demény, P.},
editor = {McNicoll, G.},
booktitle = {Encyclopedia of population},
address = {New York},
publisher = {Macmillan reference},
pages = {155--157},
}