1. Hull, J.R.: Supercond. Sci. Technol. 13, R-1 (2000)
2. Moon, F.C.: Superconducting Levitation. Wiley, New York (1994)
3. Shultz, L., de Haas, O., Verges, P., Beyer, C., Rohlig, S., Olisen, H., Kuhn, L., Berger, D., Noteboom, U., Funk, U.: IEEE Trans. Appl. Supercond. 15, 2031–2035 (2005)
4. Putman, P.T., Zhou, Y.X., Fang, H., Klawitter, A., Salama, K.: Supercond. Sci. Technol. 18, S6–S9 (2005)
5. Jiasu, W., Suyu, W., Youwen, Z., Haiyu, H., et al.: Physica C 378–381, 809–814 (2002)