F. Lehmann, and R. Wille. Conceptual Structures: Applications, Implementation
and Theory, volume 954 of Lecture Notes in Computer Science, Springer, Berlin/Heidelberg, (1995)
F. Lehmann, and R. Wille. Conceptual structures: applications, implementation and theory, volume 954 of Lecture Notes in Artificial Intelligence, page 32-43. London, UK, Springer Verlag, (1995)
F. Lehmann, and R. Wille. Conceptual structures: applications, implementation and theory, 954, page 32-43. Berlin--Heidelberg--New~York, Springer--Verlag, (1995)
F. Lehmann, and R. Wille. Conceptual structures: applications, implementation and theory, 954, page 32-43. Berlin--Heidelberg--New~York, Springer--Verlag, (1995)