2011 · Golnar Karimian, Manon Buist‐Homan, et al. · University of Groningen research database (University of Groningen / Centre for Information Technology)
2011 · Paul J.W.H. Kappelle, de Jan Freark Boer, et al. · University of Groningen research database (University of Groningen / Centre for Information Technology)
2010 · J.F. de Boer, Theo H. van Dijk, et al. · University of Groningen research database (University of Groningen / Centre for Information Technology)
2009 · Golnar Karimian, Manon Buist‐Homan, et al. · University of Groningen research database (University of Groningen / Centre for Information Technology)
2006 · Miranda Van Eck, Menno Hoekstra, et al. · University of Groningen research database (University of Groningen / Centre for Information Technology)