By Zerrik E.   Kamal A.   Boutoulout A.   in International Journal of Systems Science

ISSN:1464-5319|33|4|239-246

Taylor & Francis Ltd‎(2002)‎

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By Zerrik E.   Boutoulout A.   Jai A. El   in International Journal of Systems Science

ISSN:1464-5319|31|1|73-82

Taylor & Francis Ltd‎(2000)‎

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