- document
- Gjaltema, A. (author), Arts, P.A.M. (author), Van Loosdrecht, M.C.M. (author), Kuenen, J.G. (author), Heijnen, J.J. (author) journal article 1994
- document
- Boogerd, F.C. (author), Bos, P. (author), Kuenen, J.G. (author), Heijnen, J.J. (author), Van der Lans, R.G.J.M. (author) journal article 1990