@conference {geissler1996,
	title = {A 3D-sensor for the measurement of particle concentration from image sequences},
	booktitle = {Proc. 18th Int. Congr. for Photogrammetry and Remote Sensing},
	volume = {31},
	number = {B5},
	year = {1996},
	pages = {194--199},
	doi = {10.5281/zenodo.14895},
	url = {http://www.isprs.org/proceedings/XXXI/congress/part5/},
	author = {Peter Gei{\ss}ler and Bernd J{\"a}hne and P. Waldh{\"a}usl},
	editor = {K. Kraus}
}
