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Grummer B, Beer M, Liebler-Tenorio E, Greiser-Wilke I.Grummer B, et al. Among authors: beer m.J Gen Virol. 2001 Nov;82(Pt 11):2597-2605. doi: 10.1099/0022-1317-82-11-2597.J Gen Virol. 2001.PMID: 11602770
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Beer M, Wolf G.Beer M, et al.Berl Munch Tierarztl Wochenschr. 2003 May-Jun;116(5-6):252-8.Berl Munch Tierarztl Wochenschr. 2003.PMID: 12784561Review.German.