Boulicaut, J.-F., Bykowski, A. & Rigotti, C.
(2000).
Approximation of Frequency Queries by Means of Free-Sets.
PKDD '00: Proceedings of the 4th European Conference on Principles
of Data Mining and Knowledge Discovery (p./pp. 75--85),
London, UK: Springer-Verlag.
ISBN: 3-540-41066-X