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- [8] MINIMAX ESTIMATION OF A NORMAL MEAN VECTOR WHEN THE COVARIANCE-MATRIX IS UNKNOWN ANNALS OF STATISTICS, 1979, 7 (04): : 838 - 846
- [9] ESTIMATION FOR A LINEAR-REGRESSION MODEL WITH UNKNOWN DIAGONAL COVARIANCE-MATRIX ANNALS OF STATISTICS, 1978, 6 (05): : 1149 - 1158