By Lucas Stephen K.   in American Mathematical Monthly

ISSN:1930-0972|116|2|166-172

Mathematical Association of America‎(2009)‎

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By Buckley C. Edward   Klemawesch Stephen J.   Lucas Stephen K.   in Allergy and Asthma Proceedings

ISSN:1539-6304|6|1|63-70

OceanSide Publications, Inc‎(1985)‎

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