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Muehlemann, Barbara; Vinner, Lasse; Margaryan, Ashot; Wilhelmson, Helene; Castro, Constanza de la Fuente; Allentoft, Morten E.; Damgaard, Peter de Barros; Hansen, Anders Johannes; Nielsen, Sofie Holtsmark; Strand, Lisa Mariann; Bill, Jan; Buzhilova, Alexandra; Pushkina, Tamara; Falys, Ceri; Khartanovich, Valeri; Moiseyev, Vyacheslav; Jorkov, Marie Louise Schjellerup; Sorensen, Palle Ostergaard; Magnusson, Yvonne; Gustin, Ingrid; Schroeder, Hannes; Sutter, Gerd; Smith, Geoffrey L.; Drosten, Christian; Fouchier, Ron A. M.; Smith, Derek J.; Willerslev, Eske; Jones, Terry C.; Sikora, Martin (2020): Diverse variola virus (smallpox) strains were widespread in northern Europe in the Viking Age. In: Science, Vol. 369, No. 6502, eaaw8977