R. Jäschke, und S. Rudolph. Contributions to the 11th International Conference on Formal Concept Analysis, Seite 19--34. Technische Universität Dresden, (Mai 2013)
J. Pickens, G. Golovchinsky, C. Shah, P. Qvarfordt, und M. Back. Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, Seite 315--322. New York, NY, USA, ACM, (2008)