O. M. Shabanov, R. T. Kachaev, L. A. Kazieva, “High-voltage conductivity of $\alpha$-Rb$_4$I$_5$, $\alpha$-KAg$_4$I$_5$, and $\alpha$-KCu$_4$I$_5$ superionic conductors”, Zhurnal Tekhnicheskoi Fiziki, 82:8 (2012), 119–123; Tech. Phys., 57:8 (2012), 1157–1161
