By Kohli J.   Vashistha S.   in Acta Mathematica Hungarica

ISSN:0236-5294|115|1-2|37-47

Springer Publishing Company ‎(2007)‎

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By Kohli J.   Kumar S.   Vashistha S.   in Acta Mathematica Hungarica

ISSN:0236-5294|129|4|378-380

Springer Publishing Company ‎(2010)‎

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