@inproceedings{SIGIR-2009-PascaA,
	author        = "Marius Pasca and Enrique Alfonseca",
	booktitle     = "{Proceedings of the 32nd International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1571941.1572043",
	isbn          = "978-1-60558-483-6",
	pages         = "596--603",
	publisher     = "{ACM}",
	title         = "{Web-derived resources for web information retrieval: from conceptual hierarchies to attribute hierarchies}",
	year          = 2009,
}