P.J. Ward. “River Meuse Suspended Sediment Yield: A New Estimate and past Estimates Revisited by P.J. Ward: A Reply to Prof. A. Pissart, by P.J. Ward ”. Netherlands Journal of Geosciences, vol. 87, Dec. 2008, pp. 365 -66, doi:10.1017/S001677460002343X.