@article{Skirbekka2012,
author = {Vegard Skirbekka and Elke Loichinger and Daniela Weber},
title = {Variation in cognitive functioning as a refined approach to comparing aging across countries},
journal = {Proc Natl Acad Sci},
year = {2012},
month = {Jan},
volume = {109},
number = {3},
pages = {770–774},
url = {},
}