Affanni, Paola, et al. “Virological Surveillance of Influenza in the Eight Epidemic Seasons After the 2009 Pandemic in Emilia-Romagna (Northern Italy)”. Acta Biomedica Atenei Parmensis, vol. 90, no. 9-S, Sept. 2019, pp. 35-44, https://doi.org/10.23750/abm.v90i9-S.8722.