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