1. Tyre/road noise reference book;Sandberg,2002
2. International Organization for Standardization ISO 13325:2003 tyres Coast-by methods for measurement of tyre-to-road sound emission.
3. Regulation (EC) No. 661/2009 of the european parliament and of the council of 13 July 2009 concerning type-approval requirements for the general safety of motor vehicles, their trailers and systems, components and separate technical units intended therefore.
4. Regulation (EC) No. 1222/2009 of the European parliament and of the council of 25 November 2009 on the labelling of tyres with respect to fuel efficiency and other essential parameters.