Volume 23.1, Issue 45, April 1990, Pages 139-143
A.A. SALEM; S.M. EL-GIBALY; M.E. SHAWKAT; S.I. IBRAHIM; A.R. NADA
Volume 22.2, Issue 44, January 1990, Pages 62-66
A.A. SALEM; M.E. SHAWKAT; M.A. EL-SEIFY; A. KHATEIB
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