Isolation and identification of pandemic influenza virus H1N1/2009 S-OIV from commercial and backyard swine in Costa Rica. Ciencias Veterinarias, [S. l.], v. 29, n. 2, p. 57–85, 2014. Disponível em: https://www.revistas.una.ac.cr/index.php/veterinaria/article/view/6040.. Acesso em: 3 may. 2024.