@article {515841,
	title = {Heterogeneous Treatment Effects in the Presence of Self-Selection: A Propensity Score Perspective},
	journal = {Sociological Methodology},
	volume = {50},
	number = {1},
	year = {2020},
	pages = {350-385},
	url = {https://journals.sagepub.com/eprint/ZYSDWAAYXY4ATGSD6PQK/full},
	author = {Xiang Zhou and Yu Xie}
}
