Journal article (2000) - PJM van Bentum (author), E van der Horst (author), MEJ Boonman (author), A Priem (author), W.R. Hagen (author), EJ Reijerse (author), M Gross (author), P Goy (author), M Martinelli (author), A Collgiani (author)

Journal article (1998) - KMH Lenssen (author), MEJ Boonman (author), JR Kraayeveld (author), CT Foxon (author)