@article{Coale1991,
author = {Coale, A.J.},
title= {Excess female mortality and the balance of the sexes in the population: An estimate of the number of `missing females'},
year = {1991},
doi = {10.2307/1971953},
journal = {Population and Development Review},
volume = {17},
number = {3},
pages = {517--523},
}