By Kohli J. K.   Singh D.   in Acta Mathematica Hungarica

ISSN:0236-5294|110|1-2|67-80

Springer Publishing Company ‎(2006)‎

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By Kohli J.K.   Singh D.   in Acta Mathematica Hungarica

ISSN:0236-5294|106|4|317-329

Springer Publishing Company ‎(2005)‎

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By Kohli J.K.   Prasannan A.R.   in Fuzzy Sets and Systems

ISSN:0165-0114|116|3|415-420

Elsevier‎(2000)‎

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