Volume 23.2, Issue 46, July 1990, Pages 81-87
R.R. YOUSSEF; O.A. OSMAN; SEHAM ABDEL RASHEED; S.M.T., RASHWAN; M.A. MOUAZ; N. NAZIR
Volume 23.1, Issue 45, April 1990, Pages 57-63
O.A. OSMAN; SEHAM ABDEL RASHEED; S. MAKEEN; R.A. DIMITRI; M.A. MOUAZ; R.R. YOUSSEF