KAISER, L. An influenza smiley. Swiss Medical Weekly, [S. l.], v. 139, n. 2122, p. 298–298, 2009. DOI: 10.4414/smw.2009.12842. Disponível em: https://smw.ch/index.php/smw/article/view/981. Acesso em: 2 aug. 2024.