1. Bezan A., et al. Noise pollution a serious threat for human health. 6th Civil Engineer International Congress in Tehran, 2011.
2. Roschke P. Roadway Soundwall and Sound-Reducing Modules Used Therein. US5965852 A, USA, 1999.
3. Transportation Research. Porous Asphalt. 86/RRRI/228, Department of Transportation, Tehran.
4. UNHCS Design Specifications for Porous Asphalt Pavement. University of New Hampshire, New Hampshire, 2009.
5. Makarewicz R. The annual average sound level of road traffic noise estimated from the speed-flow diagram. Applied Acoustics, Vol. 74, Issue 5, 2013, p. 669-674.