Dewi, K., H. Khair, and M. Irsyad. “Development of Green Pavement for Reducing Oxides of Nitrogen (NOx) in the Ambient Air”. Journal of Engineering and Technological Sciences, vol. 48, no. 2, May 2016, pp. 159-72, doi:10.5614/j.eng.technol.sci.2016.48.2.3.