1. Why can a decrease in dB(A) produce an increase in loudness?
2. L162 Directive 2000/14/EC of the European Parliament and of the Council of 8 May 2000 on the Approximation of the Laws of the Member States to Noise Emission in the Environment by Equipment for Use Outdoorshttp://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv:OJ.L_.2000.162.01.0001.01.ENG&toc=OJ:L:2000:162:TOC
3. L157 Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on Machinery, and Amending Directive 95/16/EC (Recast)http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv:OJ.L_.2006.157.01.0024.01.ENG&toc=OJ:L:2006:157:TOC
4. From Noise Levels to Sound Quality: The Successful Approach to Improve the Acoustic Comfort;Carletti,2012