J. Borges, and M. Levene. European Conference on Principles and Practice of Knowledge Discovery in Databases (PKDD), page 34--45. Berlin, Heidelberg, Springer Berlin Heidelberg, (2005)
R. Kumar, M. Raghu, T. Sarlós, and A. Tomkins. International Conference on World Wide Web, page 411--419. International World Wide Web Conferences Steering Committee, (2017)
M. Pennings, D. Swierstra, and H. Vogt. Proceedings of the 4th International Symposium of Programming Language
Implementation and Logic Programming, Leuven, BE: PLILP '92, page 130--144. Berlin, DE, Springer-Verlag, (1992)
K. Schewe, and J. Turull Torres. Proceedings of the 2006 Conference on Information Modelling and Knowledge Bases XVII, page 237--244. Amsterdam, The Netherlands, The Netherlands, IOS Press, (2006)