Aymé S, Schmidtke J. Networking for rare diseases: a necessity for Europe. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz. December 2007, 50 (12): 1477–83. PMID 18026888. doi:10.1007/s00103-007-0381-9.
van de Laar FA, Bor H, van de Lisdonk EH. Prevalence of zebras in general practice: data from the Continuous Morbidity Registration Nijmegen.. Eur J Gen Pract. 14. 2008,. Suppl 1 (s1): 44–6. PMID 18949644. doi:10.1080/13814780802436176.
Aymé S, Schmidtke J. Networking for rare diseases: a necessity for Europe. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz. December 2007, 50 (12): 1477–83. PMID 18026888. doi:10.1007/s00103-007-0381-9.
van de Laar FA, Bor H, van de Lisdonk EH. Prevalence of zebras in general practice: data from the Continuous Morbidity Registration Nijmegen.. Eur J Gen Pract. 14. 2008,. Suppl 1 (s1): 44–6. PMID 18949644. doi:10.1080/13814780802436176.