Šarūna Skuodis, A. Norkus, N. Dirgėlienė, and L. Rimkus, “Determining characteristic sand shear parameters of strength via a direct shear test”, JCEM, vol. 22, no. 2, pp. 271–278, Mar. 2016, doi: 10.3846/13923730.2015.1073174.