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@article {645, 
  author = {Kaie Kubjas and Elina Robeva and Bernd Sturmfels},
   title = {Fixed points of the EM algorithms and nonnegative rank boundaries},
    year = {2015},
 journal = {Annals of Statistics },
  volume = {43},
  number = {1},
   pages = {pp.422-461}
}