By Gjini Nertila   in Periodica Mathematica Hungarica

ISSN:0031-5303|47|1-2|73-87

Springer Publishing Company ‎(2003)‎

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By Akiyama Shigeki   Gjini Nertila   in Archiv der Mathematik

ISSN:0003-889X|82|2|153-163

Springer Publishing Company ‎(2004)‎

Access to resources Favorite 21.978836