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Source:
http://www.mat.ub.edu/EMIS/journals/JIPAM/images/155_06_JIPAM/155_06.pdf.
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تفاصيل العنوان
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Source:
http://www.emis.de/journals/JIPAM/images/202_05_JIPAM/202_05.pdf.
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تفاصيل العنوان