Does solar ultraviolet radiation play a role in COVID-19 infection and deaths? An environmental ecological study in Italy, Isaia, G., Diémoz H., Maluta F., Fountoulakis I., Ceccon D., Di Sarra Alcide, Facta S., Fedele F., Lorenzetto G., Siani A.M., et al. , Science of the Total Environment, Jan-02-2021, Volume 757, p.143757, (2021)

Experimental determination of cloud influence on the spectral UV irradiance and implications for biological effects, Mateos, D., Di Sarra Alcide, Meloni Daniela, Di Biagio C., and Sferlazzo Damiano Massimo , Journal of Atmospheric and Solar-Terrestrial Physics, Volume 73, Number 13, p.1739-1746, (2011)