1. Palese P, Shaw ML (2007) Orthomyxoviridae: the viruses and their replication. In: Knipe DM, Howley PM, editors. Fields Virology 5th edition Philadelphia: Lippincott Williams & Wilkins. pp 1647–1689.
2. Emergence of a novel swine-origin influenza A (H1N1) virus in humans. N Engl J Med,2009
3. Filamentous forms associated with newly isolated influenza virus. Lancet;CM Chu,1949
4. In vitro and in vivo characterization of new swine-origin H1N1 influenza viruses. Nature;Y Itoh,2009
5. Spherical influenza viruses have a fitness advantage in embryonated eggs, while filament-producing strains are selected in vivo. Journal of Virol;J Seladi-Schulman,2013