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  1. From Nuisance Variables to Explanatory Theories: A Reformulation of the Third Variable Problem.Brian D. Haig - 1992 - Educational Philosophy and Theory 24 (2):78-97.
  • From nuisance variables to explanatory theories: A reformulation of the third variable problem.Brian D. Haig - 1992 - Educational Philosophy and Theory 24 (2):78–97.