1. H. Kirchner: Proc. Intern. Conf. Magnetic Structures in Superconductors, Argonne National Laboratory, Report ANL-8054 (1973)
2. F. Bitter: Phys. Rev. 38, 1903 (1931)
3. B.M. Balashova, Yu.V. Sharvin: Zh. Eksp. Teor. Fiz. 31, 40 (1956) [Sov. Phys.-JETP 4, 54 (1957)]
4. A.L. Schawlow, G.E. Devlin, J.K. Hulm: Phys. Rev. 116, 626 (1959)
5. P.B. Alers: Phys. Rev. 105, 104 (1957)