Volume 25.2, Issue 50, July 1991, Pages 193-204
G.M. OTHMAN; S.F. ISMAIL; A.S. OBEAD
Volume 12.2, Issue 24, September 1984, Pages 201-206
G.M. OTHMAN
Volume 12.2, Issue 24, September 1984, Pages 207-216
G.M. OTHMAN; M.T. SAMY; M.E. HATEM; S.M. SALEH