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 Scholz, T, J\'e4hne, B, Suhr, H, Wehnert, G, Geissler, P and Schneider, K (1996). In-situ determination of cell concentration in bioreactors with a new depth-from-focus technique. Proc.\\ Optical 3-D Measurement Techniques IV, Zurich, Sept. 29 - Oct. 2, 1997. 392--399\par \par }