Monitoring the noise level around the Jiu Valley mines using Bruel&Kjaer noise dose meter type 4448Alexandra Stanimirescu Soica, Florin Flavius Soica, Angela Egri and Mirela Ancuta RaduMATEC Web Conf., 342 (2021) 03010DOI: https://doi.org/10.1051/matecconf/202134203010