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  1. 1

    Perfect numbers by Shoemaker, Richard Warren, 1918-

    Reston, Va., National Council of Teachers of Mathematics 1973
    Format: Book


  2. 2

    Perfect matchings and applications by Ciucu, Mihai, 1968-

    Fukuoka, Japan : Faculty of Mathematics, Kyushu University, 2010
    Format: Book


  3. 3

    Perfect numbers by Bezuszka, Stanley J., 1914-2008

    Chestnut Hill, Mass. : Boston College Press, 1980
    Format: Book