Volume 18.1, Issue 35, January 1987, Pages 135-144
B.I. EL-MOULA; A.M. RAGAB; ZAKI G. AHMED; A.M. TAWFFEK
Volume 18.1, Issue 35, January 1987, Pages 219-226
A.M. RAGAB; N.A. SALEH; L.M. ELSHABINY; I.H. SOKKAR