P. Leenheer. Vrije Universiteit Brussel, FACULTY OF SCIENCE, Department of Computer
Science, Semantics Technology and Applications Research Lab, Belgium, (мая 2009)
A. de Moor, P. Leenheer, и R. Meersman. Proceedings of the 14th International Conference on Conceptual Structures (ICCS 2006), том 4068 из Lecture Notes in Computer Science, стр. 189-202. Springer, (2006)
P. Leenheer, и C. Debruyne. Proceedings of OTM Confederated International Workshops and Posters,
Monterrey, Mexico, November 9-14, 2008., Springer, (2008)