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- Hengst, S. (author) other 1999
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- Stavenuiter, J. (author), Hengst, S. (author) report 1999
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- Hengst, S. (author), Schmal, D. (author), Mallant, R.K.A.M. (author) other 1999
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- Hengst, S. (author) other 1999
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- Hengst, S. (author) other 1999
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- Stoop, J.A. (author), Hengst, S. (author) other 1999
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- Hengst, S. (author) other 1999
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- Hengst, S. (author) book 1999
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- Hengst, S. (author) lecture notes 1999
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- Hengst, S. (author) other 1999
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- Hengst, S. (author) other 1999
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- Hengst, S. (author) other 1999