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- Casteleyn, J.A. (author) report 1978
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- Kuur, P. van der (author) report 1977
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- Kuur, P. van der (author) report 1977
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De Gaay, A.C. (author)A few kilometres after crossing the Dutch frontier the Waal splits off from the river Rhine and flows to the left carrying 70% of the Rhine's water. A few kilometres further down, the IJssel splits off and flows to the right carrying 12% of the water coming down the Rhine. The river Rhine turns to the left carrying the remaining 18% of its...report 1970
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- Breusers, H.N.C. (author) report 1965
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- Sybesma, R.P (author) report 1961