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document
Suylen, G.M.H. (author), Stefess, G.C. (author), Kuenen, J.G. (author)
journal article 1986
document
Stefess, G.C. (author), Torremans, R.A.M. (author), De Schrijver, R. (author), Robertson, L.A. (author), Kuenen, J.G. (author)
journal article 1996
document
Visser, J.M. (author), Stefess, G.C. (author), Robertson, L.A. (author), Kuenen, J.G. (author)
journal article 1997