1. P. Abrahamsson, J. Warsta, M.T. Siponen, J. Ronkainen, New directions on agile methods: a comparative analysis, in: Proceedings of the 25th International Conference on Software Engineering, Portland, 2003, pp. 244–254.
2. Maintaining knowledge about temporal intervals;Allen;Communications of the ACM,1983
3. The Object Primer: Agile Model Driven Development with UML 2;Ambler,2004
4. W.N. Borst, Construction of Engineering Ontologies, Centre for Telematica and Information Technology, University of Tweenty, Enschede, The Netherlands, 1997.
5. Child’s Talk: Learning to Use Language;Bruner,1983