Ćwiąkała, Michał, et al. “Soil Stabilisation With the Use of Hydraulic Road Binders on the Basis of Brown Coal Fly Ash”. Roads and Bridges - Drogi I Mosty, vol. 11, no. 3, Apr. 2012, pp. 195-14, https://rabdim.pl/index.php/rb/article/view/v11n3p195.