Volume 23.2, Issue 46, July 1990, Pages 22-36
R.A. SAYED; AZIZA A. SELIM; G. KAMEL; M.R. FATHEL-BAB
Volume 23.2, Issue 46, July 1990, Pages 37-53
M.R. FATHEL-BAB; G. KAMEL; AZIZA A. SELIM; R.A. SAYED