R. Nesselrath, и D. Porta. Proceedings of the 7th IJCAI Workshop on Knowledge and Reasoning in Practical Dialogue Systems (KRPDS-11), стр. 37-47. (июля 2011)
A. Neto, и R. de Mattos Fortes. Proceedings of the 28th ACM International Conference on Design of Communication, стр. 151--158. New York, NY, USA, ACM, (2010)
R. Schaefer, S. Bleul, и W. Mueller. Task Models and Diagrams for Users Interface Design, том 4385 из Lecture Notes in Computer Science, глава 4, Springer-Verlag, Berlin/Heidelberg, (2007)