Volume 31.1, Issue 61, April 1994, Pages 56-86
H.M. ABOUL-DAHAB; M.R. EL-HELW; A.E. YASEENH; G.S. AMIN
Volume 30.2, Issue 60, January 1994, Pages 329-362
H.A. ABOUL DAHAB; M.R. EL—HELW; A.E. YASEENH; G.S. AMIN