@article{Carvalho:2016,
  author  = "F. Carvalho and R. Zmyślony and J. Mexia",
  title   = "Normal models with Orthogonal Block Structure",
  journal = "International Journal of Mathematical and Computational Methods",
  volume  = "Vol. 1",
  pages   = "159--164",
  year    = "2016",
}