@article{Fonseca:2008,
  author  = "M. Fonseca and J. Mexia and R. Zmyślony",
  title   = "Inference in normal models with commutative orthogonal block structure",
  journal = "Acta et Commentationes Universitatis Tartuensis de Mathematica",
  volume  = "Vol. 12",
  pages   = "3--16",
  year    = "2008",
}