Volume 20.1, Issue 39, May 1988, Pages 141-148
A.A. AMER; M. EL-TRABILI; A.H. BAYOUMI; A. EL-SEBAI
Volume 4.2, Issue 8, May 1977, Pages 279-288
G.E. ABD-EL-HAFIZ; F.E. EL-HOMMOSI; A.A. AMER; A. EL-SEBAI