Zoni, Roberta, et al. “Poliovirus and Non-Polio-Enterovirus Environmental Surveillance in Parma Within the ‘Global Polio Eradication Program’ (GPEI)”. Acta Biomedica Atenei Parmensis, vol. 90, no. 9-S, Sept. 2019, pp. 95-97, https://doi.org/10.23750/abm.v90i9-S.8702.