Volume 31, Issue 1, January 2008, Pages 7-12
A. F. Ahmed; F. M. El-Kholy; A. S. Abd El-Ghafaar; A. M. Osheiba
Volume 24, Issue 4, October 2001, Pages 143-158
T.S. Radwa; S.A. Mahmoud; Z.M. El-Barbary