Peggy Cellier Sébastien Ferré Olivier Ridoux Mireille Ducassé An Algorithm to Find Frequent Concepts of a Formal Context with Taxonomy. 226-231 2006 CLA http://dx.doi.org/10.1007/978-3-540-78921-5_15 conf/cla/2006 db/conf/cla/cla2006.html#CellierFRD06