Volume 44.1, Issue 87, October 2000, Pages 255-263
G.A. Megahed; Bahy El-Gamal; G. Abdel-All; A.L.E. Mahmoud
Volume 43.2, Issue 86, July 2000, Pages 188-199
A.M. Sayed; A.L.E. Mahmoud; A.A. Abou ElAlla