@Article{dlr,
  author = 	{A.P. Dempster and N.M. Laird and D.B. Rubin},
  title =       {Maximum Likelihood from Incomplete Data via The EM Algorithm},
  journal = 	{Journal of the Royal Statistical Society},
  year = 	1977,
  volume = 	39,
  pages = 	{1-38},
}

@Book{snedecor_cochran,
  ALTauthor = 	 {G.W. Snedecor and W.G. Cochran},
  title = 	 {Statistical Methods},
  publisher = 	 {Iowa State University Press},
  year = 	 {1989},
  edition = 	 {8},
}