Volume 53, Issue 112, January 2007, Pages 1-16
R.M.A. KHALIFA; AMANY I. HAMZA; M.I. ARAFA; NEVEEN A. EL-NISR; WAFAA G. MAHMOED
Volume 51, Issue 105, April 2005, Pages 1-10
G.H. ABED; R.M.A. KHALIFA; NAWAL A. MAZEN; B.SH. ABD EL-MALECK
Volume 26.1, Issue 51, October 1991, Pages 161-168
A.M. MANDOUR; R.M.A. KHALIFA; M. EL-SAID; A.I. SAAD
Volume 12.1, Issue 23, May 1984, Pages 78-81
M.A.M. FAHMY; M.S. ARAFA; R.M.A. KHALIFA; A.M . EL-BADR; M.E.M. MONIB