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Small Sample Properties of Tests of Equality between Sets of Coefficients in Two Linear Regressions under Heteroscedasticity.
Ohtani, Kazuhiro, (1985)
Testing equality between sets of coefficients after a preliminary test for equality of disturbance variances in two linear regressions
Toyoda, Toshihisa, (1986)
Testing linear hypothesis on regression coefficients after a pre-test for disturbance variance