- document
- de Graaf, G. (author), Bartek, M. (author), Xiao, Z. (author), van Mullem, C.J. (author), Wolffenbuttel, R.F. (author) journal article 2001
- document
- de Graaf, G. (author), Wolffenbuttel, R.F. (author) journal article 1997
- document
- Wolffenbuttel, R.F. (author), de Graaf, G. (author) journal article 1995
- document
- Wolffenbuttel, R.F. (author), Blaauw, E.J. (author), Wolffenbuttel, M.R. (author), de Graaf, G. (author) journal article 1991