@ARTICLE {
	NTjda15,
	TITLE = "Bottom-$k$ Document Retrieval",
	AUTHOR = "G. Navarro and S. V. Thankachan", 
	JOURNAL = "Journal of Discrete Algorithms",
	YEAR = 2015,
	PUBLISHER = "Elsevier Science",
	VOLUME = 32,
	PAGES = "69--74"
	}