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Volume 54, Issue 117, April 2008, Pages 1-8
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Volume 39.1, Issue 77, April 1998, Pages 145-153
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Volume 34.1, Issue 67, October 1995, Pages 110-128
M. ABD EL-NASSER; A.SH. SEDDEK; AHLAM ABDEL-HAMID; I. EL-SAEDY