@ARTICLE{
	BS10,
	AUTHOR	  = "Benjamin Bustos and Tom\'{a}\v{s} Skopal",
	TITLE	  = "Beyond the metric space model",
	JOURNAL	  = "SIGSPATIAL Special",
 	VOLUME	  = "2",
 	NUMBER	  = "2",
	PAGES	  = "20--23",
	PUBLISHER = "ACM",
	ADDRESS	  = "New York, NY, USA",
	YEAR	  = "2010"
}