Volume 25.2, Issue 50, July 1991, Pages 80-89
N.A. EL-WANIS; F.S. EL-DERHALLI; A.M. NASSAR; ELHAM EL-BIARy; FAKRIA EL-BORDENI; SALWA EL-ASIL Y; NADIA HASAN; NARGIS M. BARHOUMA