Volume 27.1, Issue 53, April 1992, Pages 238-240
H.A. YOUSSEF; SAMIA M. SELIEM
Volume 24.2, Issue 48, January 1991, Pages 1-9
M.A. ALAM EL-DIN; I.H. AHMED; M.E. ABDEL-MONIE; SAMIA M. SELIEM
Volume 23.2, Issue 46, July 1990, Pages 197-202
H.A. YOUSSEF; SAMIA M. SELIEM; F.M. MAKADY