Marian Drusa, Jozef Vlcek, Walter Scherfel, and Bronislav Sedlar. “TESTING OF FOAM CONCRETE FOR DEFINITION OF LAYER INTERACTING WITH SUBSOIL IN GEOTECHNICAL APPLICATIONS”. GEOMATE Journal, vol. 17, no. 59, July 2019, pp. 115-20, https://geomatejournal.com/geomate/article/view/268.