Journal article (2001) - K Vreugdenhil (author), G Alberts (author), Pieter van Gelder (author), P. H.A.J.M. van Gelder (author), Pieter van Gelder (author), P. H.A.J.M. Gelder (author), P.H.A.J.M. van Gelder (author), Pieter van van Gelder (author), P.H.A.J.M. Gelder (author), Pieter Gelder (author)