@INBOOK {
	AUTHOR = "Daniel Keim and Benjamin Bustos and Stefan Berchtold and Hans-Peter Kriegel",
	TITLE = "Indexing, X-tree",
	BOOKTITLE = "Encyclopedia of GIS, 2nd ed.",
	PAGES = "999-1004",
	YEAR = "2017",
	PUBLISHER = "Springer International Publishing AG",
	ADDRESS = "Gewerbestrasse 11, 6330 Cham, Switzerland",
	}