By Vértesi P.   in Periodica Mathematica Hungarica

ISSN:0031-5303|40|2|195-203

Springer Publishing Company ‎(2000)‎

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By Szili L   Vértesi P.   in Acta Mathematica Hungarica

ISSN:0236-5294|98|1-2|129-162

Springer Publishing Company ‎(2003)‎

Access to resources Favorite 13.166241