By Andreatta Marco   in The Mathematical Intelligencer

ISSN:0343-6993|33|1|72-76

Springer Publishing Company ‎(2011)‎

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By Andreatta Marco   Novelli Carla   in Annali di Matematica Pura ed Applicata

ISSN:0373-3114|186|2|281-288

Springer Publishing Company ‎(2007)‎

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