@article{Tim12,
	author  = { Ville Timonen },
	title   = { {Low-Complexity Intervisibility in Height Fields} },
	journal = { Computer Graphics Forum },
	year    = { 2012 },
	volume  = { 31 },
	number  = { 8 },
	pages   = { 2348--2362 },
	url     = { http://wili.cc/research/hfivisib/ }
}