Some articles available on the web.
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A special basis for the Leech lattice,
Indagationes Mathematicae 90 (1987), 73--86.
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Non archimedean Hopf surfaces,
Journal de théorie des nombres de Bordeaux 3.2 (1991), 405--466.
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(With Marius van der Put),
Symmetric spaces associated to split algebraic groups over a local field,
Journal für die reine und angewandte Mathematik 433 (1992), 69--100.
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On the action of the unitary group on the projective plane over a local field,
Journal of the Australian Mathematical Society 62 No 3 (1997), 371--397.
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(With Marius van der Put),
Mumford coverings of the projective line,
Archiv der mathematik 80 (2003), 98--105.
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(With Marius van der Put),
Discontinuous subgroups of PGL2(K)
Journal of Algebra 271 (2004), 234--280.
Some preprints.