1. Stephen E. Selkowitz; “Thermal Performance of Insulating Window Systems”. Proceedings of the A.S.H.R.A.E. 1979 Annual Meeting, Detroit, Michigan, June 24–28 1979.
2. Comité Permanent des Industries du Verre de la C.E.E. and Groupement European des Producteurs de Verre Plat; “Contribution of Glass Products to Energy Saving”. December 1980.
3. P. G. T. Owens and M. Barnett; “Reducing Glazing U Values with Low Emissivity Coating and Low Conductivity Gases”. Building Services Engineer. February 1974, Vol. 41.
4. C.C.B./Cumali Associates – Oakland California; “Determination of Maximum Beneficial Window Size for Single Family Residences”.Nat.Fen.Council 1980
5. Building Services Research and Information Association; Research Contract 2636 ‘Study to Evaluate the Amount of Useful Solar Energy Passing through Windows which offsets the Heating Requirement of a well controlled Building’; M. J. Homes August 1977. Research Contract 3026 ‘Study to Evaluate the Amount of Useful Solar Energy Passing through Windows which offsets the Heating Requirements of a well controlled Dwelling’; G. Hamilton March 1980.