By Fazli K.   Behboodian J.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|33|2|299-302

Taylor & Francis Ltd‎(2002)‎

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By Taheri S.M.   Behboodian J.   in Fuzzy Sets and Systems

ISSN:0165-0114|123|1|39-48

Elsevier‎(2001)‎

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