1. Arnesen H., Aschehoug Ø., Uvsløkk S. and Aske I. (1996) Thermal transmittance, U-value, of wood window with vacuum glazing. International Energy Agency Solar Heating and Cooling Program, Working Paper T18/B9/NOR2/96.
2. Assarsson T. (1985) Heat-insulating glass. European Patent No. 0047725.
3. ASTM (1991) Standard procedures for determining the steady state thermal transmittance of fenestration systems, ASTM Standard E 1423-91. In 1994 Annual Book of ASTM Standards 04.07. American Society of Testing and Materials, pp. 1160–1165.
4. Measurement of hardness;Auerbach;Ann. Phys. Chem.,1891
5. Bachli E. (1991) Thermally insulating construction and/or lighting element. European Patent No. 0247098B1 (1992)/U.S. Patent No. 5009218.