@article{Kozioł:2016,
  author  = "A. Kozioł",
  title   = "Best unbiased estimates for parameters of three-level multivariate data with doubly exchangeable covariance structure and structured mean vector",
  journal = "Discussiones Mathematicae : Probability and Statistics",
  volume  = "Vol. 36",
  number  = "no. 1-2",
  pages   = "93--113",
  year    = "2016",
}