@book {Hengl2008Elsevier,
	title = {Geomorphometry: Concepts, Software, Applications},
	volume = {33},
	year = {2008},
	pages = {772},
	publisher = {Elsevier},
	organization = {Elsevier},
	address = {Amsterdam},
	editor = {Hengl, T. and Reuter, H.I.}
}