Promotoren prof. dr. W.L. van der Pol prof. dr. J. Hendrikse Copromotoren dr. H.S. Goedee dr. ir. M. Froeling The research described in this thesis was supported by a grant of the Prinses Beatrix Spierfonds (W.OR17-21). Financial support by the Prinses Beatrix Spierfonds for the publication of this thesis is gratefully acknowledged.
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