1. Chugaev, L.A., Zh. Rus. Fiz.-Khim. Obshch., 1905, vol. 37, no. 2, p. 243.
2. Chugaev, L.A., Z. Anorg. Chem., 1905, vol. 46, p. 144.
3. Allen, F.H., Acta Crystallogr.,Sect. B: Struct. Sci., 2002, vol. 58, p. 380.
4. Chugaev, L.A., Izbrannye trudy (Selected Works), vol. 1 Chernyaev, I.I., Eds., Мoscow: Izd. AN SSSR, 1954, p. 636.
5. Ablov, A.V., Simonov, Yu.A., Malinovskii, S.T., et al., Dokl. Akad. Nauk SSSR, 1975, vol. 221, no. 3, p. 605.