@inbook{Wunsch2006,
author = {Wunsch, G.},
title= {Confounding variables, standarization, and the problem of summary indices, chapter 15},
year = {2006},
editor = {Caselli, G.},
editor = {Vallin, J.},
editor = {Wunsch, G.},
booktitle = {Demography. Analysis and Synthesis},
address = {San Diego},
publisher = {Academic Press},
pages = {197--208},
}