Laukaitis, A., and L. J. Kunskaitė. “Investigation into Low Density Porous Concrete Penetrability by Air / Mažo Tankio Akytojo Betono Oro Laidumo Tyrimai”. Journal of Civil Engineering and Management, vol. 2, no. 7, Sept. 1996, pp. 41-45, doi:10.3846/13921525.1996.10531654.