Volume 27.2, Issue 54, July 1992, Pages 236-241
SAMIA M. SELEIM; M.A. SELEIM; H.A. YOUSSEF; S. ABDALLA
Volume 27.1, Issue 53, April 1992, Pages 279-283
SAMIA M. SELEI M; M.A. SEL EIM; F.A. MAKADY; S. ABDALLA