A simplified estimate of the effective reproduction number using its relation with the doubling time and application to Italian COVID-19 dataGianluca Bonifazi, Luca Lista, Dario Menasce, Mauro Mezzetto, Daniele Pedrini, Roberto Spighi and Antonio ZoccoliEur. Phys. J. Plus, 136 4 (2021) 386DOI: https://doi.org/10.1140/epjp/s13360-021-01339-6