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- Lee, G.E.M. van der (author), Penning, W.E. (author), Duel, H. (author), Boogaard, H.F.P. van den (author) report 2003
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- Lee, G.E.M. van der (author), Geilen, N. (author), Duel, H. (author), Penning, W.E. (author) report 2002
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Duel, H. (author), Baptist, M.J. (author), Penning, W.E. (author)A new strategy based on floodplain measures for both flood risk management and enhancement of the biodiversity of the river Rhine.report 2001