By Khedr F.H.   Zeyada F.M.   Sayed O.R.   in Fuzzy Sets and Systems

ISSN:0165-0114|116|3|325-337

Elsevier‎(2000)‎

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By Khedr F.H.   Zeyada F.M.   Sayed O.R.   in Fuzzy Sets and Systems

ISSN:0165-0114|119|3|439-458

Elsevier‎(2001)‎

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By Abd El-Hakeim K.M.   Zeyada F.M.   Sayed O.R.   in Fuzzy Sets and Systems

ISSN:0165-0114|119|3|459-471

Elsevier‎(2001)‎

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By Noiri T.   Sayed O. R.   in Acta Mathematica Hungarica

ISSN:0236-5294|111|1-2|1-8

Springer Publishing Company ‎(2006)‎

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