1. S. V. Vonsovsky, Magnetizm [Magnetism] (Moskva: Nauka: 1971) (in Russian).
2. ‘Orbital Glass’ Effects. 2. Hardness. Quantum Theory. Galois Groups
3. A. I. Mitsek, Fazovyye Perekhody v Kristallakh s Magnitnoy Strukturoy [Phase Transitions in Crystals with a Magnetic Structure] (Kiev: Naukova Dumka: 1989) (in Russian).
4. A. V. Deryagin and A. V. Andreev, ZhETF, 71, No. 9: 1166 (1976) (in Russian).
5. N. Chebotarev, Osnovy Teorii Galua [Basics of Galois Theory] (Moskva: Gosudarstvennoye Tekhniko-Teoreticheskoye Izdatel'stvo: 1934) (in Russian).