1. R. McGrath, A.C. Frost: Glass in Architecture and Decoration (Architectural Press, London 1961)
2. Pilkington website: http://www.pilkington.com/pilkington-information/about+pilkington/education/default.htm (consulted May 2017)
3. EN 572-2: Glass in Building – Basic Soda Lime Silicate Glass Products – Part 2: Float Glass (CEN, Brussels 2004)
4. J. Schneider: Glass strength in the borehole area of annealed float glass and tempered float glass, Int. J. Form. Process. 7(4), 523–541 (2004)
5. Äppert v. Schmertz, Schmertz v. Äppert: Decisions of the Commissioner of Patents and of the United States Courts in Patent and Trade-Mark Cases (Government Printing Office, Washington 1899) 77–81, 524–534