Baller M., Boorsma M., Frijters D.H, van Marwijk H.W, Nijpels G., van Hout H.P.  2010.  Depression in Dutch homes for the elderly: under-diagnosis in demented residents? Int J Geriatr Psychiatry. 25(7):712-8.

Boorsma M., Joling K.J, Frijters D.H, Ribbe M.E, Nijpels G., van Hout H.P.  2012.  The prevalence, incidence and risk factors for delirium in Dutch nursing homes and residential care homes. Int J Geriatr Psychiatry. 27(7):709-15.

Vaal J., Gussekloo J., de Klerk M.M, Frijters D.H, Evenhuis H.M, van Beek A.P, van Nispen R.M, Smits C., Deeg D.J.  2007.  [Combined vision and hearing impairment: in an estimated 30,000-35,000 people aged 55 years or over in The Netherlands].. Nederlands Tijdschrift voor Geneeskunde. 151(26):1459-63.