1. Madison: Conference papers. Ist Int. Symposium Building Systems AutomationIntegration, June 2–8, Madison, Wisconsin. Dept. of Eng. Professional Development, College of Engineering, University of Wisconsin-Madison/Extension, Madison (1991).
2. Howell, I.: The need for interoperability in the construction industry. In: INCIT 96 Proceedings. The Institution of Engineers, ACT, Australia (1996) 43–48.
3. Studies in Environmental Research No. T6;B-C. Bjork,1987
4. Bjork, B-C.: Basic structure of a proposed building product model. CAD (1989) 21(2): 71–77.
5. Gielingh, W.F.: General AEC Reference Model (GARM). ISO TC184/SC4/WG1 Document N329 (1989).