By Fonf V.P.   Zanco C.   in Positivity

ISSN:1385-1292|8|3|269-281

Springer Publishing Company ‎(2004)‎

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By Fonf V. P.   Smith R. J.   Troyanski S.   in Quarterly Journal of Mathematics

ISSN:1464-3847|63|2|375-380

Oxford University Press‎(2012)‎

Access to resources Favorite 4.6113005