Grygierek, Marcin. “Variability of Elastic Moduli of Unbound Layers of Road Pavements Subjected to Ravelling Strains Due to Mining”. Roads and Bridges – Drogi i Mosty 9, no. 2 (April 1, 2010): 17–30. Accessed May 2, 2025. https://www.rabdim.pl/index.php/rb/article/view/v9n2p17.