O. I. Buzhinskiĭ, V. V. Lopatin, V. P. Chernenko, “Physicochemical and electrophysical properties of high-temperature insulating ceramics for use in elemental vapor lasers”, Kvantovaya Elektronika, 8:8 (1981), 1697–1701 [Sov J Quantum Electron, 11:8 (1981), 1026–1028]
