Volume 18.1, Issue 35, January 1987, Pages 63-68
KADIGA A. HASSAN; M.B. EL-SALAHY
Volume 18.1, Issue 35, January 1987, Pages 69-74
KHADIGA A. HASSAN; M.B. EL-SALAHY
Volume 17.2, Issue 34, September 1986, Pages 70-75
KHADIGA A. HASSAN; M.B. EL-SALAHY