@article{Yang2006,
author = {Yang, Y. and Land, K.C.},
title= {A mixed models approach to age-period-cohort analysis of repeated cross-section surveys: Trends in verbal test scores},
year = {2006},
doi = {10.1111/j.1467-9531.2006.00175.x},
volume = {36},
pages = {75--97},
}