MONAZZAM, M. R., NADERZADEH, M., NASSIRI, P., & FARD, S. M. B. (2013). Performance of Environmental T-shape Noise Barriers Covered with Primitive Root Diffusers. Archives of Acoustics, 35(4), 565–578. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/214