@article{Qian2014,
author = {Qian, Y. and Qian, Z.},
title= {The gender divide in urban China: Singlehood and assortative mating by age and education},
year = {2014},
doi = {10.4054/DemRes.2014.31.45},
journal = {Demographic Research},
volume = {31},
number = {45},
pages = {1337--1364},
}