Radziszewski, Piotr, et al. “Estimation of Road Bitumen Cohesion on the Basis of Ductility Test in Temperature Function”. Roads and Bridges - Drogi I Mosty, vol. 1, no. 1, Dec. 2014, pp. 101-13, https://rabdim.pl/index.php/rb/article/view/v1n1p101.