@article{Frenk2013,
author = {Frenk, S.M. and Yang, Y. and Land, K.C.},
title= {Assessing the significance of cohort and period effects in hierarchical age-period-cohort models: applications to verbal test scores and voter turnout in US presidential elections},
year = {2013},
doi = {10.1093/sf/sot066},
journal = {Social Forces},
volume = {92},
number = {1},
pages = {221--248},
}