Eklund, P. and Groh, B. and Stumme, G. and Wille, R.. Contextual-Logic Extension of TOSCANA.. Conceptual Structures: Logical, Linguistic, and Computational. editor(s) Ganter, B. and Mineau, G. W.. LNAI, (1867) 453-467, Springer, Heidelberg, Year 2000.

Prediger, Susanne and Wille, Rudolf. The Lattice of Concept Graphs of a Relationally Scaled Context. ICCS. editor(s) Tepfenhart, William M. and Cyre, Walling R.. Lecture Notes in Computer Science, (1640) 401-414, Springer, Year 1999.

Wille, Rudolf. Conceptual Graphs and Formal Concept Analysis. Conceptual Structures: Fulfilling Peirce's Dream. editor(s) Lukose, D. and Delugach, H. and Keeler, M. and Searle, L. and Sowa, J. F.. Lecture Notes in Artificial Intelligence, (1257) 290--303, Springer, Heidelberg, Year 1997.

Stumme, Gerd and Wille, Rudolf. A Geometrical Heuristic for Drawing Concept Lattices. Graph Drawing. editor(s) Tamassia, R. and Tollis, I.G.. LNCS, (894) 452-459, Springer, Heidelberg, Year 1995.