Volume 57, Issue 131, October 2011, Pages 1-12
MARCEL F. GALAB; AMAL A.MEGAHED; ABEER S.ABDU-ELRAHMAN
Volume 57, Issue 128, January 2011, Pages 1-21
MUNA E. KHOGALI; Y.M.I. DAGASH; M.G. EL-HAG
Volume 54, Issue 117, April 2008, Pages 1-13
H.A. MAHMOUD
Volume 51, Issue 106, July 2005, Pages 1-13
A.A. BAKR