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- van Kalverkamp, J. (author) master thesis 1991
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- Rijkswaterstaat (author) report 1991
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- Havenbedrijf Rotterdam (author) report 1990
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- Stoopman, J. (author) other 1990
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- Drewry Shipping Consultants (author) public lecture 1988
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- Drewry Shipping Consultants (author) report 1988
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- Nederlands Maritiem Instituut (author) report 1977
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- Nederlands Maritiem Instituut (author) report 1976