A. F. Franchini, F. Auxilia, P. M. Galimberti, M. A. Piga, S. Castaldi, and A. Porro, “COVID 19 and Spanish flu pandemics: All it changes, nothing changes: COVID 19 epidemic”, Acta Biomed, vol. 91, no. 2, pp. 245–250, May 2020, doi: 10.23750/abm.v91i2.9625.