@INPROCEEDINGS
        { NNsoda12,
          TITLE = "Top-$k$ Document Retrieval in Optimal Time and Linear Space",
          AUTHOR = "G. Navarro and Y. Nekrich",
          BOOKTITLE = {Proc. 23rd Annual ACM-SIAM Symposium on Discrete Algorithms (SODA)},
          YEAR = 2012,
	  PAGES = "1066--1078"
        }