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Equalities between OLSE, BLUE and BLUP in the linear model
Haslett, Stephen, (2014)
Generalized, Linear, and Mixed Models, Second Edition by Charles E. McCulloch, Shayle R. Searle, John M. Neuhaus
Puntanen, Simo, (2009)
Orthogonal Projectors—Solution
Puntanen, Simo, (1997)