1. Some Approaches to the Theory of Information Systems;Langefors;BIT, Bind 3,1963
2. Toward integration of engineering data processing and automatization of design;Langefors,1963
3. Theoretical Analysis of Information Systems;Langefors,1966
4. B. Langefors, Concepts, Elementary Files, and Data Terms, IB-ADB 69
5. Systemering 70;Langefors,1970