@article{Haak1942,
author = {Haak, L.A.},
title= {A new method of analysing the age and sex composition of a population},
year = {1942},
URL = {http://digital.library.okstate.edu/OAS/oas_pdf/v23/p84_86.pdf},
journal = {Proceedings of the Oklahoma Academy of Science},
volume = {23},
pages = {84‒86},
}