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2. Analysis of covariance: Its nature and uses;Cochran;Biometrics,1957
3. Causal inference, prior knowledge, and the statistics of employment discrimination;Dempster,1981
4. Reverse regression and salary discrimination;Goldberger,1982
5. Large-sample covariance analysis when the control variable is fallible;Lord;J. Amer. Statist. Assoc.,1960