An Online Ontology: WiktionaryZ. - Erik M. van Mulligen; Erik Möller; Peter-Jan Roes; Marc Weeber; Gerard Meijssen; Barend Mons (KR-MED, 2006)

Literature-based concept profiles for gene annotation: The issue of weighting. - Rob Jelier; Martijn J. Schuemie; Peter-Jan Roes; Erik M. van Mulligen; Jan A. Kors (Int. J. Medical Informatics, 2008)