Volume 20.2, Issue 40, September 1988, Pages 1-6
WAFAA F. ALI; NAHED EL-TOUKHY; A. ABOUL-ELA; F.A. SOLIMAN
Volume 17.1, Issue 33, May 1986, Pages 14-21
A.H.S. HASSAN; A. ABOUL-ELA; M.R. FATH EL-BAB; AZIZA A. SELIM