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- van Boheemen, A.E. (author), Dirkse, C. (author), Hengst, S. (author) other 1997
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- van Boheemen, A.E. (author), Dirkse, C. (author), Hengst, S. (author), Takken, R.J.J.F. (author) other 1997
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- Dirkse, C. (author), Hengst, S. (author), Takken, R.J.J.F. (author) other 1997
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- van Boheemen, A.E. (author), Dirkse, C. (author), Hengst, S. (author) other 1997
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- Dirkse, C. (author), Hengst, S. (author), de Roos, M.D.J. (author) other 1997
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- Dirkse, C. (author), Hengst, S. (author), Takken, R.J.J.F. (author) other 1997