Volume 40.2, Issue 80, January 1999, Pages 32-55
H. Badawi; Yousria A. Abd-Elrahman; A.O, Salem; A.M. Mohamed
Volume 39.1, Issue 77, April 1998, Pages 36-53
H. Badawi; Yousria A. Abd El-Rahman; A.O. Salem; A.M. Mohamed