Antiviral activity and possible mechanisms of action of pentagalloylglucose (PGG) against influenza A virus - Ge Liu; Sheng Xiong; Yang-Fei Xiang; Chao-Wan Guo; Feng Ge; Chong-Ren Yang; Ying-Jun Zhang; Yi-Fei Wang; Kaio Kitazato (Archives of Virology, 2011)