1. Hohle Glasscheibe German Patent Application No. 387655;Zoller,1913
2. Laser sealed vacuum insulation window;Benson,1987
3. Method of fabricating a thermal pane window and product;Kreisman,1983
4. Evacuated Windows-theory and Practice, ISES Solar World Congress International Solar Energy Society;Robinson,1989
5. Insulating glazing unit;Parker,1991