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Chaokun Wang Jianzhong Li Shengfei Shi <i>N</i>-gram inverted index structures on music data for theme mining and content-based information retrieval. 492-503 2006 27 Pattern Recognition Letters 5 http://dx.doi.org/10.1016/j.patrec.2005.09.012 db/journals/prl/prl27.html#WangLS06