Veronesi, L., E. Capobianco, and P. Affanni, et al. 2007. “Legionella Contamination in the Water System of Hospital Dental Settings”. Acta Biomedica Atenei Parmensis 78 (2): 117-22. https://mattioli1885journals.com/index.php/actabiomedica/article/view/1913.