1. Akhmetov, N.S., Obshchaya i neorganicheskaya khimiya (General and Inorganic Chemistry), Moscow: Vysshaya Shkola, 1998, p. 744.
2. Samsonov, G.V., Serebryakova, T.I., and Neronov, V.A., Boridy (Borides), Moscow: Atomizdat, 1975, p. 375.
3. Serebryakova, T.I., Neronov, V.A., and Peshev, P.D., Vysokotemperaturnye boridy (High-Temperature Borides), Moscow: Metallurgiya, 1991, p. 367.
4. Kornilov, I.I., Metallidy i vzaimodeistvie mezhdu nimi (The Chemistry of Metallides), Moscow: Nauka, 1964, p. 181.
5. Samsonov, G.V., Markovskii, L.Ya., Zhigach, A.F., and Valyashko, M.G., Bor, ego soedineniya i splavy (Boron and Boron Compounds and Alloys), Kiev: Akad. Nauk Ukr. SSR, 1960, p. 589.