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1[1] Trochim,William M.K. . Pattern Matching, Validity, and Conceptualization in Program Evaluation
Evaluation Review , 1985, Volume 9 (5): 575-604
[2] Campbell, Donald T. “‘Degrees of Freedom’ and the Case Study.” Ed. E Samuel Overman. Comparative Political Studies 8.2 (1975) : 178-193.
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