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document
Van Gent, H.A. (author), Nijkamp, P. (author), Rodenburg, C.A. (author)
book 1998
document
Nijkamp, P. (author), Priemus, H. (author), Van Gent, H.A. (author), Van den Hanenberg, A.G.M. (author), Kreutzberger, E. (author), Stam, W.J. (author)
book 1990