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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
De Boer, A.P.N. (author), Reijnders, W.N.M. (author), Kuenen, J.G. (author), Stouthamer, A.H. (author), Van Spanning, R.J.M. (author)
journal article 1994