Grubliauskas, Raimondas, and Donatas Butkus. “Optimal Height Calculation and Modelling of Noise Barrier”. Mokslas – Lietuvos ateitis / Science – Future of Lithuania 1, no. 4 (April 12, 2011): 30-34. Accessed September 24, 2021. https://journals.vgtu.lt/index.php/MLA/article/view/10690.