Volume 24.2, Issue 48, January 1991, Pages 188-196
A.M. HAFEZ; S.A. RAZIG; S. EL-AMROUSI; A.B. AL HENDI
Volume 19.1, Issue 37, September 1987, Pages 139-145
A.M. HAFEZ; S.A. RAZIG; S. EL-AMROUSI; R.O. RAMADAN