L. Pizzutti dos Santos, J. and do Nascimento Mutti, C. 1991. Qualification of the acoustic insulation laboratory of the Federal University of Santa Maria according to the international standard ISO 140. Acoustics and Vibrations (Acústica e Vibrações). 6, 09 (Jun. 1991), 2–4. DOI:https://doi.org/10.55753/aev.v6e09.72.