1. D. V. Zaretskii and V. K. Sirotkin, Sov. J. Nucl. Phys., 39, 370 (1984); E. A. Kolomensky et al., Phys. Lett. B, 107, 272 (1981); Yu. G. Abov, P. A. Krupchitssky, and Yu. A. Oratovsky, Phys. Lett. B, 12, 25 (1964); V. M. Lobashev et al., JETP Letters, 3, 173 (1966).
2. V. P. Alfimenkov, Sov. Phys. Usp., 27, 797 (1984); L. P. Gor’kov and I. E. Dzyaloshinskii, JETP, 40, 197 (1975).
3. S. M. Troshin and N. E. Tyurin, Phys. Usp., 37, 991 (1994); Spin in High-energy Physics [in Russian], Nauka, Moscow (1991).
4. G. V. Danilyan, Sov. Phys. Usp., 23, 323 (1980).
5. E. M. Lifchitz and L. P. Pitaevskii, Electrodynamique des milieux continus [in Russian] (Vol. 8 of Physique théorique by L. D. Landau and E. M. Lifchitz), Nauka, Moscow (1982); French transl., Mir, Moscow (1990).