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Supported in part by National Science Foundation grant GP-36418X.
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Fleischner, H. The importance of being Euler. Abh.Math.Semin.Univ.Hambg. 42, 90–99 (1974). https://doi.org/10.1007/BF02993540
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DOI: https://doi.org/10.1007/BF02993540