@article{Gao2022,
author = {Gao, X. and Li, M.},
title= {Differences between returns to education in urban and rural china and its evolution from 1989 to 2019},
year = {2022},
doi = {10.1371/journal.pone.0274506},
volume = {17},
number = {10},
pages = {0274506},
}