1. Sawaguchi M. Study of effective new product development activities trough combination of patterns of evolution of technological systems and VE. 2001.
2. Levy A, Rajaraman A, Ordille K. Querying heterogeneous information sources using source descriptions. In: Proceedings of the 22nd VLDB conference, 1996.
3. Making knowledge tangible;Blake,2000
4. Zlotin A, Zusman A. Managing innovation knowledge, Ideation International Inc., February 1999.
5. Ontologies: principles, methods and applications;Uschold;Knowledge Eng Rev,1996