By Duggal K.L.   in Acta Applicandae Mathematicae

ISSN:0167-8019|67|1|91-115

Springer Publishing Company ‎(2001)‎

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By Duggal K. L.   Sahin B.   in Acta Mathematica Hungarica

ISSN:0236-5294|106|1-2|137-165

Springer Publishing Company ‎(2005)‎

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