R. Miller, Y. Ioannidis, and R. Ramakrishnan. VLDB '93: Proceedings of the 19th International Conference on Very Large Data Bases, page 120--133. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (1993)
C. Britton, S. Jones, M. Kutar, M. Loomes, and B. Robinson. First International Conference on Theory and Application of Diagrams, page 376--391. Edinburgh, Scotland, UK, Springer Berlin, (September 2000)
M. Frank, A. Agarwal, and M. Vernon. Proceedings of the Sixth ACM SIGPLAN Symposium on Principles &
Practice of Parallel Programming, June 18--21, 1997, ACM, (1997)
O. Corby, R. Dieng, and C. Hébert. Conceptual Structures: Logical, Linguistic, and Computational
Issues, 8th International Conference on Conceptual Structures,
ICCS 2000, Darmstadt, Germany, August 14-18, 2000, Proceedings, volume 1867 of LNCS, page 468--482. Springer, (2000)