@conference {SinFra04,
	title = {Learning depth},
	booktitle = {{Proc. 7.~T{\"u}binger Wahrnehmungskonferenz (TWK 2004)}},
	year = {2004},
	pages = {68},
	publisher = {Knirsch},
	organization = {Knirsch},
	address = {Kirchentellinsfurt}
}
