By Galaz-Fontes F.   in American Mathematical Monthly

ISSN:1930-0972|120|5|466-466

Mathematical Association of America‎(2013)‎

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By Calabuig J.   Galaz-Fontes F.   Jiménez-Fernández E.   Sánchez Pérez E.   in Mathematische Zeitschrift

ISSN:0025-5874|257|2|381-402

Springer Publishing Company ‎(2007)‎

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