1. G. Altarelli, G. Parisi, Nucl. Phys. B 126, 297 (1977)
2. V.N. Gribov, L.N. Lipatov, Sov. J. Nucl. Phys. 15, 438 (1972)
3. L.N. Lipatov, Sov. J. Nucl. Phys. 20, 95 (1972)
4. YuL Dokshitzer, Sov. Phys. JETP 46, 641 (1977)
5. B.I. Ermolaev, M. Greco, S.I. Troyan, Riv. Nuovo Cim. 33, 57 (2010)