Department
of Mathematics, Faculty of Science,
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Institute for
Studies in Theoretical Physics and
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Imam Khomeini International
University,
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Mathematics
(IPM),
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Postal
Code 34149-16818, P.O. Box
288,
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P.O.
Box 19395-5746,
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Qazvin, IRAN.
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Tehran, IRAN.
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Fax:(0098)(2813780040),
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Fax:(0098)(2122290648),
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