Nucleic acid-based detection of influenza A virus subtypes H7 and N9 with a special emphasis on the avian H7N9 virus Kalthoff, D and Bogs, J and Harder, T and Grund, C and Pohlmann, A and Beer, M and Hoffmann, B, Eurosurveillance, 19, 20731 (2014), https://doi.org/10.2807/1560-7917.ES2014.19.10.20731