1. A.H. Mueller, J. Phys. G 17, 1443 (1991)
2. L.N. Lipatov, Sov. J. Nucl. Phys. 23, 338 (1976)
3. E.A. Kuraev, L.N. Lipatov, V.S. Fadin, Sov. Phys. JETP 45, 199 (1977)
4. I.I. Balitsky, L.N. Lipatov, Sov. J. Nucl. Phys. 28, 822 (1978)
5. G. Altarelli, G. Parisi, Nucl. Phys. B 126, 298 (1977)