1. Scott, G.B., in: Proceedings of the International School of Physics Enrico Fermi, LXX, 1978, p. 445.
2. Višňovský, Š., Krishnan, R., Prosser, V., Novák, S., Barvík, I.: Physica B 89 (1977) 73.
3. Yu-chuan, Ho, Shih-chun, Chang, Tie-lian Kuan: IEEE Trans. Magn. 14 (1978) 457.
4. Andlauer, B., Tolksdorf, W.: J. Appl. Phys. 50 (1979) 7986.
5. Lucari, F., Mastrogiuseppe, C., Tomassetti, G.: J. Phys. C 12 (1979) 3597.