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  1.  31
    Four-Fold Magic.C. Planck - 1910 - The Monist 20 (4):617-630.
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  2.  16
    General Rule for Constructing Ornate Magic Squares of Orders = 0 (Mod. 4).C. Planck - 1916 - The Monist 26 (3):463-470.
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    General Rule for Constructing Ornate Magic Squares of Orders = 0 (Mod. 4).C. Planck - 1916 - The Monist 26 (3):463-470.
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  4.  42
    Pandiagonal Magics of Orders 6 and 10 with Minimal Numbers.C. Planck - 1919 - The Monist 29 (2):307-316.
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    The Theory of Reversions.C. Planck - 1912 - The Monist 22 (1):53-81.
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