1. B. J. Batlogg, R. Buhrman, J. R. Clem, et al., J. Supercond. 10, 583 (1997).
2. Y. Shiohara and A. Endo, Mater. Sci. Eng. R 19, 1 (1997).
3. Y. Shiohara and E. A. Goodilin, in Handbook on the Physics and Chemistry of Rare-Earths, Ed. by K. A. Gschneidner et al. (Elsevier Sci., Amsterdam, 2000), Vol. 30, Chap. 189, pp. 67–221.
4. J. L. MacManus-Driscoll, Annu. Rev. Mater. Sci. 28, 421 (1998).
5. Yu. D. Tret’yakov and E. A. Gudilin, Usp. Khim. 69(1), 3 (2000).