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S. D. Walter, Matched Case-Control Studies with a Variable Number of Controls per Case, Journal of the Royal Statistical Society. Series C (Applied Statistics), Vol. 29, No. 2 (1980), pp. 172-179 ...
KEVIN A. CLARKE, The Phantom Menace: Omitted Variable Bias in Econometric Research, Conflict Management and Peace Science, Vol. 22, No. 4, SPECIAL ISSUE: Model Specification and Control Variables ...