Deltuva, Juozas. “Research on the Stability of Building Mixture Structure/Statybinių Mišinių Struktūros Tyrimas”. Journal of Civil Engineering and Management 7, no. 6 (December 31, 2001): 441-445. Accessed November 21, 2019. https://journals.vgtu.lt/index.php/JCEM/article/view/9228.