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document
Plante, Merel (author), Toxopeus, Serge (author), Blok, Jan (author), Keuning, Alexander (author)
conference paper 1998
document
Blok, J.J. (author), Aalbers, A.B. (author)
conference paper 1991
document
Blok, Jan J. (author), Beukelman, Wim (author)
conference paper 1984