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2. Brazilian Occupational Health Standard NHO-01, 2001. Labor Ministry, Federal Governement of Brasil (in Portuguese).
3. Brazilian Standard for Ergonomics NR-17, 1997. Labor Ministry, Federal Governement of Brasil (in Portuguese).
4. Exposure of the Australian Population to Road Traffic Noise;Brown;Applied Acoustics,1994
5. Technical Documentation—Sound Calibrator BK 4231;Brüel,1998