1. V. Adelskold, Ark. Kemi, Mineral. Geol. A 12 (29), 1 (1938).
2. S. V. Trukhanov, A. V. Trukhanov, V. G. Kostishin, et al., JETP Lett. 103, 100 (2016).
3. J. B. Goodenough, Magnetism and the Chemical Bond, Vol. 1 of Interscience Monographs on Chemistry (John Wiley and Sons, New York, 1963).
4. E. Kreber and U. Gonser, Appl. Phys. 10, 175 (1976).
5. A. S. Kamzin, L. P. Ol’khovik, and V. L. Rozenbaum, Fiz. Tverd. Tela 41, 483 (1999).