Volume 57, Issue 130, July 2011, Pages 1-28
M.A. EL-SEIFY; O.M. MAHRAN; A.M.I. ABD EL AAL
Volume 27.2, Issue 54, July 1992, Pages 99-107
M.M EL-BAHI; M.G. HASSAN; M.A. EL-SEIFY
Volume 23.2, Issue 46, July 1990, Pages 97-101
M.A. EL-SEIFY
Volume 23.1, Issue 45, April 1990, Pages 64-74
M.A. EL-SEIFY; ZAKIA G.A.; M.G. AGGOUR
Volume 23.1, Issue 45, April 1990, Pages 144-158
A.A. SALEM; SAMIA, A.H.; M.A. EL-SEIFY; G.H. EL-BATTAWY
Volume 22.2, Issue 44, January 1990, Pages 62-66
A.A. SALEM; M.E. SHAWKAT; M.A. EL-SEIFY; A. KHATEIB
Volume 22.2, Issue 44, January 1990, Pages 67-74
A.A. SALEM; M.E. SHAUKAT; M.A. EL-SEIFY; A. KATEIB