Volume 26.2, Issue 52, January 1992, Pages 59-63
E.A. MABROUK; S.A.A. EL-SALAM; S.S. IBRAHIM
Volume 23.2, Issue 46, July 1990, Pages 68-80
E.A. MABROUK; H. EL-HINDI; H.A.H. SALEM; S.S. IBRAHIM; A.A. FARAHAT