L. Huisman,
«Rapid filtration : part 1». Delft University of Technology, Department of Civil Engineering, Delft, The Netherlands, p. figs., 1979.
L. Huisman,
«Treatment methods for water supplies rural areas of developing countries». Delft University of Technology, Department of Civil Engineering, Delft, The Netherlands, p. 52 p. : 43 figs., 12 anns., 1979.