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Calculate seat apportionment for legislative bodies with various methods. The algorithms include divisor or highest averages methods (e.g. Jefferson, Webster or Adams), largest remainder methods and biproportional apportionment. Gaffke, N. & Pukelsheim, F. (2008) doi:10.1016/j.mathsocsci.2008.01.004 Oelbermann, K. F. (2016) doi:10.1016/j.mathsocsci.2016.02.003.