Conference paper (2007) - C van Kranenburg (author), J Schonwalder (author), J. Schonwalder (author), J Schönwälder (author), J. Schönwälder (author), F. A. Veer (author), F. Veer (author), FA Veer (author), Fred Veer (author), F.A. Veer (author), J Zuidema (author), J Zuidema (author), M Wnuk (author)