Prediger, Susanne ; Wille, Rudolf ; Tepfenhart, William M. (Bearb.) ; Cyre, Walling R. (Bearb.): The Lattice of Concept Graphs of a Relationally Scaled Context. 1640. In: ICCS : Springer, 1999 (Lecture Notes in Computer Science). - ISBN 3-540-66223-5, S. 401-414