1. D. L. Moody, "The physics of notations: toward a scientific basis for constructing visual notations in software engineering," Software Engineering, IEEE Transactions on, vol. 35, no. 6, pp. 756--779, 2009.
2. D. Kang, B. Xu, J. Lu, and W. C. Chu, "A complexity measure for on- tology based on uml," in Distributed Computing Systems, 2004. FTDCS 2004. Proceedings. 10th IEEE International Workshop on Future Trends of, pp. 222--228, IEEE, 2004.
3. M. Kušek, S. Dešić, and D. Gvozdanović, "Uml based object-oriented development: Experience with inexperienced developers," in ConTEL 2001-6th International Conference on Telecommunications, 2001.
4. G. Booch, J. Rumbaugh, and I. Jacobson, The Unified Modeling Lan- guage User Guide. Addison Wesley Professional, 2005.
5. M. Petre, "Uml in practice," in Proceedings of the 2013 International Conference on Software Engineering, pp. 722--731, IEEE Press, 2013.