1. Frei, H.P. Information retrieval - from academic research to practical applications. In: Proceedings of the 5th Annual Symposium on Document Analysis and Information Retrieval, Las Vegas, April 1996.
2. Clifton, H., Garcia-Molina, H., Hagmann, R.: “The Design of a Document Database”, Proc. of the ACM
3. ISO/IEC, Information Technology - Text and office systems - Document Filing and Retrieval (DFR) –
4. Fuhr, N. Toward data abstraction in networked information systems. Information Processing and Management 5(2) (1999) 101-119.
5. Jacobson, I., Griss, M. and Jonsson, P. Software reuse: Architecture, process and organization for business success. (New York: ACM Press, 1997).