@article{Pearl1920,
author = {Pearl, R. and Reead, L.J.},
title= {On the rate of growth of the population of the United States since 1790 and its mathematical representation},
year = {1920},
doi = {10.1073/pnas.6.6.275},
journal = {Proceedings of the National Academy of Sciences of the USA},
volume = {6},
number = {6},
pages = {275--288},
}