@article{Coulson1968,
author = {Coulson, M.R.C.},
title= {The distribution of population age structures in Kansas City},
year = {1968},
doi = {10.1111/j.1467-8306.1968.tb01641.x},
journal = {Annals of the Association of American Geographers},
volume = {58},
number = {1},
pages = {155--176},
}