Virulence and transmissibility of H1N2 influenza virus in ferrets imply the continuing threat of triple-reassortant swine viruses
Proc. Natl. Acad. Sci. USA, September 25, 2012 vol. 109 no. 39 15900-15905. Published online before print September 10, 2012, doi: 10.1073/pnas.1205576109