1. Lukin, E.S., Popova, N.A., Glazachev, V.S., Pavlyukova, L.T., and Kulikov, N.A., Technology, properties and applications of optically transparent oxide ceramics: Prospects for development, Konstr. Kompoz. Mater., 2015, no. 3, pp. 24–36.
2. Merkulov, Y.Yu., Solk, S.V., Dobryakov, B.N., Shevtsov, S.E., and Mikhailin, A.I., Influence of structural defects in single crystals of leucosapphire on its ballistic properties, Vopr. Oboronnoi Tekh. Ser. 16: Tekh. Sredstv Protivodeistviya Terrorizmu, 2018, nos. 5–6, pp. 88–94
3. Ramisetty, M. and Sastri, S., Transparent polycrystalline materials resist bullets, Adv. Mater. Processes, 2015, vol. 173, no. 10, pp. 25–29.
4. Yamaguchi, G. and Yanagida, H., Study on the reductive spinel – a new spinel formula AlN–Al2O3 instead of the previous one Al3O4, Bull. Chem. Soc. Jpn., 1959, vol. 32, pp. 1264–1265.
5. Long, G. and Foster, L.M., Crystal phases in the system Al2O3–AlN, J. Am. Ceram. Soc., 1961, vol. 44, no. 6, pp. 255–258.