R. Jäschke, A. Hotho, C. Schmitz, B. Ganter, и G. Stumme. Proceedings of the 6th IEEE International Conference on Data Mining (ICDM 06), стр. 907-911. Hong Kong, IEEE Computer Society, (Декабрь 2006)
C. Robardet, и F. Feschet. IDEAL '00: Proceedings of the Second International Conference on Intelligent Data Engineering and Automated Learning, Data Mining, Financial Engineering, and Intelligent Agents, стр. 565--570. London, UK, Springer-Verlag, (2000)