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 Gei\'dfler, P, J\'e4hne, B and Waldh\'e4usl, P (1996). A 3D-sensor for the measurement of particle concentration from image sequences. Proc. 18th Int. Congr. for Photogrammetry and Remote Sensing. 31 194--199. http://www.isprs.org/proceedings/XXXI/congress/part5/\par \par }