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 Eleftherios Koutsofios and Stephen C. North. Drawing graphs with dot. Available from http://graphviz.org.
 Object Management Group. OMG Unified Modeling Language Superstructure Specification, version 2.0. Object Management Group, August 2005. Available from: http://www.omg.org.
 Thomas M. Smith and Gregory W. Bond. ECharts for SIP servlets: a state-machine programming environment for VoIP applications. In IPTComm ’07: Proceedings of the 1st international conference on Principles, systems and applications of IP telecommunications, pages 89-98, New York, NY, USA, 2007. ACM. Available from: http://echarts.org.