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P. Becker. Proceedings of the 9th International Conference on Conceptual Structures, page 33-46. Department of Computer Science, University Laval, (2001)
P. Eklund, J. Ducrou, and P. Brawn. Proc. of the 2nd Int. Conference on Formal Concept Analysis, volume 2691 of LNAI, page 57--72. Springer-Verlag, (2004)