Balčiūnas, Darius. “Research into the Reliability of the Overlap Joint of Bituminous Heat Welded Roofing Materials”. Mokslas – Lietuvos ateitis / Science – Future of Lithuania 4, no. 4 (November 28, 2012): 294-299. Accessed September 24, 2021. https://journals.vgtu.lt/index.php/MLA/article/view/4563.