Volume 50, Issue 100, January 2004, Pages 188-202
S.Kh. Abd Elghaffar; A.M. Abd-Elgwad; Hebat-All A. Mohamed
Volume 43.1, Issue 85, April 2000, Pages 251-274
S.Kh. Abd Elghaffar; M. Aly; Fatma A. Moustafa; A.Z. Mahmoud
Volume 39.2, Issue 78, July 1998, Pages 130-144
D.A. Salem; S.Kh. Abd Elghaffar