@ARTICLE { AUTHOR = "Antonio Fari{\~n}a and Nieves Brisaboa and Gonzalo Navarro and Francisco Claude and Angeles Places and Eduardo Rodr{\'{\i}}guez", TITLE ="Word-based Self-Indexes for Natural Language Text", JOURNAL = "ACM Transactions on Information Systems", VOLUME = "30", NUMBER = "1", PAGES = "article 1", YEAR = "2012", PUBLISHER = "ACM Press", ADDRESS = "New York, NY, USA", ISSN = "1046-8188" }