Trifonov V, Khiabanian H, Rabadan R (Julij 2009). »Geographic dependence, surveillance, and origins of the 2009 influenza A (H1N1) virus«. The New England Journal of Medicine. 361 (2): 115–19. doi:10.1056/NEJMp0904572. PMID19474418.
Trifonov V, Khiabanian H, Rabadan R (Julij 2009). »Geographic dependence, surveillance, and origins of the 2009 influenza A (H1N1) virus«. The New England Journal of Medicine. 361 (2): 115–19. doi:10.1056/NEJMp0904572. PMID19474418.