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Two-sample inference for normal mean vectors based on monotone missing data
Yu, Jianqi, (2006)
IMPROVED ESTIMATORS OF EIGENVALUES OF Σ 1 Σ 2 -1
Gupta, A. K., (1990)
Unbiased equivariant estimation of a common normal mean vector with one observation from each population
Krishnamoorthy, K., (1994)