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- Hengst, S. (author), Kuijer, M. (author), Nienhuis, U. (author) other 2001
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- Hengst, S. (author), Kuijer, M. (author), Nienhuis, U. (author), Alblas, P. (author), Timmers, W. (author) other 2001
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- Kiezert, E. (author), Kuijer, M. (author), Nienhuis, U. (author), Alblas, P. (author), Timmers, W. (author) other 2001
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- Hengst, S. (author), Kuijer, M. (author), Nienhuis, U. (author), Saanen, Y. (author) other 2001