By Azarpanah F.   Karavan M.   in Czechoslovak Mathematical Journal

ISSN:0011-4642|55|2|397-407

Springer Publishing Company ‎(2005)‎

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By Azarpanah F.   Motamedi M.   in Acta Mathematica Hungarica

ISSN:0236-5294|108|1-2|25-36

Springer Publishing Company ‎(2005)‎

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By Azarpanah F.   Mohamadian R.   in Acta Mathematica Sinica

ISSN:1439-8516|23|6|989-996

Springer Publishing Company ‎(2007)‎

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