1. Pyatakov, A.P. and Zvezdin, A.K., Phys.-Usp., 2012, vol. 55, no. 6, p. 557.
2. Shilkina, L.A., Pavlenko, A.V., Reznichenko, L.A., and Verbenko, I.A., Crystallogr. Rep., 2016, vol. 61, no. 2, p. 263.
3. Tomashpol’ski., Yu.Ya. and Venevtsev, Yu.N., Kristallografiya, 1971, vol. 16, no. 5, p. 1037.
4. Woodward, D.I., Reaney, I.M., Eitel, R.E., and Randall, C.A., J. Appl. Phys., 2003, vol. 94, no. 5, p. 3313.
5. Burnett, T.L., Comyn, T.P., Bell, A.J., Condliffe, E., and Lloyd, G., J. Phys.: Conf. Ser., 2006, vol. 26, p. 239.