1. M. N. Wilson, Superconducting Magnets (Clarendon, Oxford, 1983; Mir, Moscow, 1985).
2. A. Vl. Gurevich, R. G. Mints, and A. L. Rakhmanov, Physics of Composite Superconductors (Nauka, Moscow, 1987).
3. V. R. Romanovskii and K. Watanabe, Supercond. Sci. Technol. 19, 541 (2006).
4. V. R. Romanovskii, Cryogenics 42, 29 (2002).
5. M. Polak, I. Hlasnik, and L. Krempasky, Cryogenics 13, 702 (1973).