1. Henrik Björklund, Wim Martens and Thomas Schwentick.
    Conjunctive query containment over trees using schema information.
    Acta Inf. 55(1):17–56, 2018.
    URL, DOI BibTeX

    @article{DBLP:journals/acta/BjorklundMS18,
    	author = {Henrik Bj{\"{o}}rklund and Wim Martens and Thomas Schwentick},
    	title = "Conjunctive query containment over trees using schema information",
    	journal = "Acta Inf.",
    	volume = 55,
    	number = 1,
    	pages = "17--56",
    	year = 2018,
    	url = "https://doi.org/10.1007/s00236-016-0282-1",
    	doi = "10.1007/s00236-016-0282-1",
    	timestamp = "Wed, 07 Feb 2018 13:19:42 +0100",
    	biburl = "https://dblp.org/rec/bib/journals/acta/BjorklundMS18",
    	bibsource = "dblp computer science bibliography, https://dblp.org"
    }