@InProceedings{	  PetersenG09ipl,
  author	= "Petersen, Holger and Grabowski, Szymon",
  title		= "Range mode and range median queries in constant time and
		  sub-quadratic space",
  journal	= "Information Processing Letters",
  volume	= "109",
  number	= "4",
  year		= "2009",
  pages		= "225--228",
  issn		= "0020-0190",
  doi		= "10.1016/j.ipl.2008.10.007"
}