Radziszewski, Piotr, Robert Ziolkowski, and Donatas Čygas. “Technological Ageing Influence on Viscosity of Selected Bitumens”. Journal of Civil Engineering and Management 9, no. 1 (March 31, 2003): 20-24. Accessed October 5, 2024. https://ijspm.vgtu.lt/index.php/JCEM/article/view/9010.