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Nieves Brisaboa, Susana Ladra, Gonzalo Navarro. K2-trees for Compact Web Graph Representation. In Jussi Kalgren, Jorma Tarhio, Heikki Hyyrö (ed.), Proc. 16th International Symposium on String Processing and Information Retrieval (SPIRE), pp. 18-30, Aug 2009. Saariselkä, Finland. Springer-Verlag, Berlin/Heidelberg, Germany. Lecture Notes in Computer Science vol. 5721. ISBN 978-3-642-03783-2.