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- Hengst, S. (author), Doorduin, J.D. (author), Stijnen, O. (author) lecture notes 1985
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- Hengst, S. (author), Doorduin, J.D. (author), Stijnen, P. (author) master thesis 1985
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- Doorduin, J.P. (author), Stijnen, P. (author), Hengst, S. (author) master thesis 1984
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- Doorduin, J.P. (author), Stijnen, P. (author), Hengst, S. (author) master thesis 1984
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- Doorduin, J.P. (author), Hengst, S. (author), Stijnen, P. (author) master thesis 1984