By Jamal S.   Kara A.H.   Bokhari Ashfaque H.   in Canadian Journal of Physics

ISSN:1208-6045|90|7|667-674

NRC Research Press‎(2012)‎

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By Ahmad A.   Bokhari Ashfaque H.   Kara A.H.   Zaman F.D.   in Quaestiones Mathematicae

ISSN:1727-933X|33|1|75-94

Taylor & Francis Ltd‎(2010)‎

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