@article{imai:kim:wang:21,
  author = {Imai, Kosuke and In Song Kim and Erik Wang},
  title = 	 {Matching Methods for Causal Inference with Time-Series Cross-Section Data},
  journal =      {American Journal of Political Science},
  year = 	 {2021},
  OPTkey = 	 {},
  OPTvol = 	 {},
  OPTnumber = 	 {},
  OPTmonth = 	 {},
  note = 	 {Forthcoming}
}