1. R.R. Galazka, J. Kossut, Lecture Notes in Physics, vol 132 (Springer, Berlin, 1980), p. 245
2. J. Mycielski, in Recent Developments in Condensed Matter Physics, ed. by J.T. Devreese (Plenum, New York, 1981), p. 257
3. N.B. Brandt, V.V. Moshchalkov, Adv. Phys. 33, 193 (1984)
4. O. Goede, W. Heimbrodt, Phys. Status Solidi B 146, 11 (1988)
5. J.K. Furdyna, J. Appl. Phys. 64, R29, (1988)