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document
Ras, J. (author), Hazelaar, M.J. (author), Robertson, L.A. (author), Kuenen, J.G. (author), Van Spanning, R.J.M. (author), Stouthamer, A.H. (author), Harms, N. (author)
journal article 1995
document
Bos, P. (author), Huber, T.F. (author), Kos, C.H. (author), Ras, C. (author), Kuenen, J.G. (author)
conference paper 1986