Volume 43.1, Issue 85, April 2000, Pages 239-250
Sanaa A.H. El-Shamy; Shahera M.R. Abdel Haseeb; Azhar M. Abdel Aziz
Volume 41.1, Issue 81, April 1999, Pages 45-59
Shahera M.R. Abdel Haseeb; A.H. Bayoumi; Sanaa A.H. El-Shamy