Yassin, S.Kh., 		Khdhir, B. H., 		Hussein, B. H., AND 		Abd, G. A..
" Improvement the Action Efficiency  of Microwave  Vacuum Tube Type GI-19B by Activation  its Intersurfaces" <em>Ibn AL- Haitham Journal For Pure and Applied Science</em> [Online], Volume 21 Number 2 (19 September 2017)