1. Ekama G.A., Barnard J.L., Günthert F.W., Krebs P., McCorquodale J.A., Parker D.S. and Wahlberg E.J. (1997) IAWQ Scientific and Technical Report No. 6: Secondary Settling Tanks: Theory, Modeling, Design and Operation. IAWQ, London
2. Settling of activated sludge in horizontal tanks;Fischerström;J. Sanit. Eng. Division; Proc. Am. Soc. Civil Eng.,1967
3. Fuchs A. (1999) Validation of Lambert–Beer Law for Suspensions Consisting of Water and Activated Sludge Flocs, in preparation
4. Hangl M. (1988) Der Lumosed: ein Photosedimentometer mit drei Lichtstrahlen (The Lumosed, a Photosedimentometer with three lightbeems). Ph.D. thesis, TU-Graz, Austria
5. Auslegung eines Absetzapparates über die Feststoffflußkurve (Design of a secondary settler by the means of solid flux curve);Reimann;F and S Filtrieren Separieren,1994