1. Galliardt, D.W., Nieveen, W.R., and Kirby, R.D., Solid State Commun., 1980, vol. 34, no. 1, p. 37.
2. Furuseth, S., Brattas, L., and Kjekshus, A., Acta Chem. Scand.,
Ser. A, 1975, vol. 29, no. 6, p. 623.
3. Gorlova, I.G., Pokrovskii, V.Ya., Zybtsev, S.G., et al., Zh. Eksp. Teor. Fiz., 2010, vol. 111, p. 298.
4. Misse, P.R.N., Berthebaud, D., Lebedev, O.I., et al., Materials, 2015, vol. 8, no. 5, p. 2514.
5. Furuseth, S. and Fjellvag, H., Acta Chem. Scand., 1991, vol. 45, no. 7, p. 694.