Volume 58, Issue 134, July 2012, Pages 1-7
A.M.A. BARAKAT; E.R.H. ATTIA; SYLVIA O. AHMED
Volume 57, Issue 129, April 2011, Pages 1-15
A.A. EL-NEWISHY; SYLVIA O. AHMED
Volume 56, Issue 127, October 2010, Pages 1-14
A.M.A. BARAKAT; SYLVIA O. AHMED
Volume 55, Issue 123, October 2009, Pages 1-18
M.A. MOHAMED; SYLVIA O. AHMED; T.Y. ABDEL MOTELIB