Volume 31.1, Issue 61, April 1994, Pages 166-174
E.H. ABDEL-HAKIEM; M.E. HAMDY; S.I. IBRAHIM
Volume 29.1, Issue 57, April 1993, Pages 143-150
H.S. ALI; S.I. IBRAHIM; A. EL-R. THABET
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 8, Issue 15.16, January 1981, Pages 99-105
M. REFAI; S. EL-GIBALI; M.S. SABER; S.I. IBRAHIM