@article{Pullum1980,
author = {Pullum, T.W.},
title= {Separating age, period, and cohort effects in white U.S. fertility, 1920–1970},
year = {1980},
doi = {10.1016/0049-089X(80)90013-7},
volume = {9},
number = {3},
pages = {225--244},
}