Volume 22, Issue 1-A, June 2011, Pages 187-202
EMAN Y. FRAG; AHMED M. MOHAMED; GEHAD G. MOHAMED; EBTESAM E. ALRAHMONY
Volume 21, Issue 2-A, December 2010, Pages 159-172
H. M. ELQUDABY; E. Y. FRAG; GEHAD G. MOHAMED; M. A. MOHAMED