D. M. Freik, B. S. Dzundza, O. B. Kostyuk, V. I. Makovyshyn, and R. S. Yavorskiy, “Surface Layers and Thermoelectric Properties of Vapor-Phase Condensation LAST Pb18Ag2-xSbxTe20 on Mica”, Phys. Chem. Sol. State, vol. 16, no. 1, pp. 93–97, Mar. 2015.