M. Atzmueller, and F. Mitzlaff. Lorentz Workshop on Mining Patterns and Subgroups, Lorentz Center, Leiden, The Netherlands. Awarded with the Best Discovery Award, (2010)
A. Lancichinetti, S. Fortunato, and J. Kertesz. (2008)cite arxiv:0802.1218
Comment: 20 pages, 8 figures. Final version published on New Journal of
Physics.