@article{Morris1975,
author = {Morris, N.M. and Udry, J.R. and Chase, C.L.},
title= {Shifting age-parity distribution of births and the decrease in infant mortality},
year = {1975},
doi = {10.2105/AJPH.65.4.359},
volume = {65},
number = {4},
pages = {359--362},
}