Volume 2, A.S.A.T. CONFERENCE 21-23 April 1987 , CAIRO, April 1987, Pages 1037-1044
M. E. EL- GAYAR; E. K. AL-HUSSAINI; A. F. HASSAN
Volume 1, A.S.A.T. CONFERENCE 14-16 May 1985 r CAIRO, May 1985, Pages 1123-1128
M. EL.GAYAR; E. K. AL.HUSSAINI; A. F. HASSAN