1. Barnett, J., Akolkar, R., Auburn, R., Bodell, M., Burnett, D., Carter, J., et al. (2015). State chart XML (SCXML) state machine notation for control abstraction. W3C Recommendation.
https://www.w3.org/TR/scxml/
.
2. Oshry, M., Auburn, R., Baggia, P., Bodell, M., Burke, D., Burnett, D., et al. (2007). Voice extensible markup language (VoiceXML) 2.1. W3C Recommendation.
https://www.w3.org/TR/2007/REC-voicexml21-20070619/
.
3. Harel, D., & Politi, M. (1998). Modeling reactive systems with statecharts: The STATEMATE approach.
http://www.wisdom.weizmann.ac.il/~dharel/reactive_systems.html
.
4. Object Management Group (2009). UML specification version 2.3.
http://www.omg.org/spec/UML/2.3/
.
5. Barnett, J. (2015). SCXML implementation report.
https://www.w3.org/Voice/2013/scxml-irp/
.