An ongoing multi-state outbreak of measles linked to non-immune anthroposophic communities in Austria, Germany, and Norway, March-April 2008 Schmid, D and Holzmann, H and Abele, S and Kasper, S and König, S and Meusburger, S and Hrabcik, H and Luckner-Hornischer, A and Bechter, E and DeMartin, A and Stirling, Jana and Heißenhuber, A and Siedler, A and Bernard, H and Pfaff , G and Schorr, D and Ludwig, M S and Zimmerman, HP and Løvoll, Ø and Aavitsland, P and Allerberger, F, Eurosurveillance, 13, 18838 (2008), https://doi.org/10.2807/ese.13.16.18838-en