Dex: high-performance exploration on large graphs for information retrieval - Norbert Martínez-Bazan; Victor Muntés-Mulero; Sergio Gómez-Villamor; Jordi Nin; Mario-A. Sánchez-Martínez; Josep Lluís Larriba-Pey (Proceedings of the Sixteenth ACM Conference on Information and Knowledge Management, CIKM 2007, Lisbon, Portugal, November 6-10, 2007, 2007)