Volume 42.1, Issue 83, October 1999, Pages 291-309
M.A.F. El-Sheltawi; Mary G. bdel-Malak; G. Abdel-Malak; T.A.A. Khalifa
Volume 40.2, Issue 80, January 1999, Pages 333-344
Mary G. Abdel-Malak; M.A. El-Sheltawi; H.M. Hassan; G. Abdel-Malak; K.N. Mettias