@article{Qian1993,
author = {Qian, Z. and Preston, S.H.},
title= {Changes in American Marriage, 1972 to 1987: Availability and Forces of Attraction by Age and Education},
year = {1993},
doi = {10.2307/2096072},
journal = {American Sociological Review},
volume = {58},
number = {4},
pages = {482--495},
}