@article{Lotka1936,
author = {Lotka, A.J.},
title= {The geographic distribution of intrinsic natural increase in the United States, and an examination of the relation between several measures of net reproductivity},
year = {1936},
doi = {10.2307/2278558},
journal = {Journal of the American Statistical Association},
volume = {31},
number = {194},
pages = {273--294},
}