Packaging signals in the 5′-ends of influenza virus PA, PB1, and PB2 genes as potential targets to develop nucleic-acid based antiviral molecules - Giannecchini, Simone; Wise, Helen M.; Digard, Paul; Clausi, Valeria; Poggetto, Edoardo Del; Vesco, Liberio; Puzelli, Simona; Donatelli, Isabella; Azzi, Alberta (Antiviral Research, 2011)