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document
Arts, P.A.M. (author), Robertson, L.A. (author), Kuenen, J.G. (author)
journal article 1995
document
Van Niel, E.W.J. (author), Robertson, L.A. (author), Cox, R.P. (author), Kuenen, J.G. (author)
journal article 1992
document
Robertson, L.A. (author), Kuenen, J.G. (author)
journal article 1992