Volume 21.1, Issue 41, January 1989, Pages 85-92
A. NAFADY; ROKIA A. SHAMIKH; A.N. NASR; M.M. SALEH; MADIHA M. MOHAMED
Volume 15.2, Issue 30, January 1986, Pages 1-9
A.N. NASR; M.N.M. SALEH; R.S. MOHAMED; M.A. GABR