GOODMAN-BACON, Andrew; MARCUS, Jan. Using Difference-in-Differences to Identify Causal Effects of COVID-19 Policies. Survey Research Methods, [S. l.], v. 14, n. 2, p. 153–158, 2020. DOI: 10.18148/srm/2020.v14i2.7723. Disponível em: https://ojs.ub.uni-konstanz.de/srm/article/view/7723. Acesso em: 19 apr. 2024.