- document
- Noorman, H.J. (author), Rakels, J.L.L. (author), Kuenen, J.G. (author), Luyben, K. (author), Heijnen, J.J. (author) journal article 1992
- document
- Geraats, S.G.M. (author), Hooijman, C.M. (author), Van Niel, E.W.J. (author), Obertson, L.A. (author), Heijnen, J.J. (author), Luyben, A.M. (author), Kuenen, J.G. (author) journal article 1990