Concept Hierarchies: A Restricted Form of Knowledge Derived From Regularities. - Molly Troxel; Kim Swarm; Jan M. Zytkow (ISMIS, 1994)

From Law-Like Knowledge to Concept Hierarchies in Data. - Molly Troxel; Kim Swarm; Robert Zembowicz; Jan M. Zytkow (KDD Workshop, 1994)