@article{Chan2012,
author = {KS Chan and KS Chan and JD Kasper and LE Pezzin},
title = {Measurement equivalence in ADL and IADL difficulty across international surveys of aging: findings from the HRS, SHARE, and ELSA},
journal = {Journals of Gerontology B: Psychological Sciences and Social Sciences},
year = {2012},
month = {Jan},
url = {http://psychsocgerontology.oxfordjournals.org/content/67B/1/121.short},
}