Cinthia Regiane Kotaka et al. 2013. Evaluation of the level of microbial contamination and prevalence of gram-negative non-fermentative rods in dental unit waterlines. Revista Sul-Brasileira de Odontologia. 9, 3 (set. 2013), 245–53. DOI:https://doi.org/10.21726/rsbo.v9i3.996.