@article{Bojarski:2009,
author
=
"J.Bojarski and S.Gnot and E.Synówka",
title
=
"Nonnegative estimation of mean Squared errors of linear predictors in mixed linear models",
journal
=
"Discussiones Mathematicae : Algebra and Stochastic Methods",
volume
=
"Vol. 19",
number
=
"no 2",
pages
=
"273--286",
year
=
"1999",
}