- document
- Gelling, J.L. (author), Keuning, J.A. (author) conference paper 2013
- document
- Keuning, J.A. (author), Visch, G.L. (author), Gelling, J.L. (author), Burema, G. (author) conference paper 2011
- document
- Kapsenberg, Geert K. (author), Keuning, Lex (author), Gelling, Jaap J. (author) conference paper 2009
- document
- Gelling, Jaap L. (author), Keuning, Lex J.A. (author) conference paper 2006