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Bleker OP, van der Meijden WI, Wittenberg J, van Bergen JE, Boeke AJ, van Doornum GJ, Henquet CJ, Galama JM, Postma MJ, Prins JM, van Voorst Vader PC; Centraal Begeleidingsorgaan voor de Intercollegiale Toetsing.Bleker OP, et al.Ned Tijdschr Geneeskd. 2003 Apr 12;147(15):695-9.Ned Tijdschr Geneeskd. 2003.PMID: 12722532Dutch.
van Weert JM, Hajenius PJ, Richard E, Wolf H, Bleker OP.van Weert JM, et al. Among authors: bleker op.Ned Tijdschr Geneeskd. 2007 Feb 17;151(7):414-7.Ned Tijdschr Geneeskd. 2007.PMID: 17343141Dutch.