@article{Cowgill1951,
author = {Cowgill, D.O. and Cowgill, M.S.},
title= {An index of segregation based on block statistics},
year = {1951},
doi = {10.2307/2087511},
journal = {American Sociological Review },
volume = {16},
number = {6},
pages = {825‒831},
}