Volume 26.1, Issue 51, October 1991, Pages 138-147
M.S. ABDEL RAHMAN; FATMA HIEKAL; M.Y. EL-SOKKARY
Volume 25.1, Issue 49, April 1991, Pages 87-97
K.I. ASHMAWY; M.Y. EL-SOKKARY
Volume 25.1, Issue 49, April 1991, Pages 98-107
K.I. A SH MAWY; M.Y. EL-SOKKARY