@ARTICLE
        { NTtcs14,
	  AUTHOR = "G. Navarro and S.V. Thankachan",
	  TITLE = "New Space/Time Tradeoffs for Top-$k$ Document Retrieval on Sequences",
	  JOURNAL = "Theoretical Computer Science",
	  YEAR = 2014,
	  VOLUME = 542,
	  PAGES = "83--97"
	}