@article{Casterline1986,
author = {Casterline, J.B. and Williams, L. and McDonald, P. },
title= {The age difference between spouses: variations among developing countries},
year = {1986},
doi = {10.1080/0032472031000142296},
journal = {Population Studies},
volume = {40},
number = {3},
pages = {353--374},
}