1. A. A. Sokolov andI. M. Ternov:Dokl. Akad. Nauk SSSR,153, 1052 (1964) (Sov. Phys. Dokl.,8, 1203 (1964)).
2. Ya. S. Derbenev andA. M. Kondratenko:Sov. Phys. JETP,37, 968 (1973).
3. L. Knudsen et al.: First observation of transverse beam polarization in LEP, CERN-PPE/91-125 (1991).
4. D. P. Barber et al.: High spin polarization at the HERAelectron storage ring, DESY 93-038 (1993).
5. J. S. Bell andJ. M. Leinaas:Nucl. Phys. B,212, 131(1983);284, 488 (1987).