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A general condition for an optimal limiting efficiency of OLS in the general linear regression model
Krämer, Walter, (1996)
Consistency, asymptotic unbiasedness and bounds on the bias of s 2 in the linear regression model with error component disturbances
Baltagi, Badi H., (1994)
On the robustness of the f-test to autocorrelation among disturbances
Krämer, Walter, (1989)