Arch Virol. 146(12):2275-89. doi: 10.1007/s007050170002. PMID:
11811679.
Ito T, Couceiro JN, Kelm S, Baum LG, Krauss S, Castrucci MR, Donatelli
I, Kida H, Paulson JC, Webster RG, Kawaoka Y. (1998) Molecular basis for
the generation in pigs of influenza A viruses with pandemic potential.