@INPROCEEDINGS{
        NTspire13.1,
        AUTHOR = "G. Navarro and S. Thankachan",
	TITLE = "Faster Top-$k$ Document Retrieval in Optimal Space",
        BOOKTITLE = {Proc. 20th International Symposium on String Processing and Information Retrieval (SPIRE)},
        YEAR = "2013",
	SERIES = "LNCS 8214",
	PAGES = "255--262"
    }