S. Sarkisyan, “TRIDIMENSIONAL WAVES AT THE INTERFACE OF TWO ELASTIC MEDIA ON CONTACT WITHOUT FRICTION”, Proc. YSU A: Phys. Math. Sci., vol. 50, no. 3 (241), pp. 79–83, Oct. 2016, doi: 10.46991/PYSU:A/2016.50.3.079.