@article{Ryder1956,
author = {Ryder, N.B.},
title= {La mesure des variations de la fécondité au cours du temps},
year = {1956},
doi = {10.2307/1525710},
URL = {http://www.jstor.org/stable/1525710},
volume = {11},
number = {1},
pages = {29‒46},
}