Kovtun, Y., Y. Siusko, E. Skibenko, and A. Skibenko. “Experimental Study of Inhomogeneous Reflex-Discharge Plasma Using Microwave Refraction Interferometry”. Ukrainian Journal of Physics, Vol. 63, no. 12, Dec. 2018, p. 1057, doi:10.15407/ujpe63.12.1057.