@article{Zeng Yi
Land2002,
author = {Zeng Yi and Land, K.C.},
title= {Adjusting period tempo changes with an extension of Ryder's basic translation equation},
year = {2002},
doi = {10.1353/dem.2002.0022},
journal = {Demography},
volume = {39},
number = {2},
pages = {269--285},
}