Volume 31.1, Issue 61, April 1994, Pages 190-199
S. FATHI; T. EL-KHATEIB; SABAH MOUSTAFA; K. HASSANEIN
Volume 23.1, Issue 45, April 1990, Pages 48-56
T. YOUNES; H. YOUSSEF; S. ABDAL-KARIM; K. HASSANEIN