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document
Gerritsma, J. (author), Keuning, J.A. (author)
journal article 1985
document
Gerritsma, J. (author), Keuning, J.A. (author)
conference paper 1985
document
Gerritsma, J. (author), Keuning, J.A. (author), Versluis, A. (author)
conference paper 1992