Volume 18.2, Issue 36, May 1987, Pages 176-182
M. ABDEL-RAOUF; A.H.S. HASSAN; G. KAMEL; M.R. FATH EL-BAB
Volume 18.2, Issue 36, May 1987, Pages 183-188
M. ABDEL-RAOUF; C.A. PAULSEN
Volume 17.1, Issue 33, May 1986, Pages 22-29
A.H.S. HASSAN; G. KAMEL; M.R. FATH EL-BAB; M. ABDEL-RAOUF