B. Berendt, A. Hotho, and G. Stumme. Proc. of the 1st Intl. Workshop on Representation and Analysis of Web Space, page 1-16. Technical University of Ostrava, (2005)
G. Stumme. Proc. 3rd Intl. Conf. on Formal Concept Analysis, volume 3403 of Lecture Notes in Computer Science, page 315-328. Heidelberg, Springer, (2005)