Eklund, P., Groh, B., Stumme, G. and Wille, R.. "Contextual-Logic Extension of TOSCANA.." Paper presented at the meeting of the Conceptual Structures: Logical, Linguistic, and Computational, Heidelberg, 2000.

Prediger, Susanne and Wille, Rudolf. "The Lattice of Concept Graphs of a Relationally Scaled Context." Paper presented at the meeting of the ICCS, 1999.

Wille, Rudolf. "Conceptual Graphs and Formal Concept Analysis." Paper presented at the meeting of the Conceptual Structures: Fulfilling Peirce's Dream, Heidelberg, 1997.

Stumme, Gerd and Wille, Rudolf. "A Geometrical Heuristic for Drawing Concept Lattices." Paper presented at the meeting of the Graph Drawing, Heidelberg, 1995.