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Time: 2024-03-29T10:42:53Z
URL: https://scholar.google.com/scholar_lookup?title=Experimental%20and%20quasi-experimental%20designs%20for%20generalized%20causal%20inference&publication_year=2002&author=W.%20R.%20Shadish&author=T.%20D.%20Cook&author=D.%20T.%20Campbell