1. V.N. Gribov, A Reggeon Diagram Technique, Sov. Phys. JETP 26 (1968) 414 [ INSPIRE ].
2. E.A. Kuraev, L.N. Lipatov and V.S. Fadin, The Pomeranchuk Singularity in Nonabelian Gauge Theories, Sov. Phys. JETP 45 (1977) 199 [ INSPIRE ].
3. I.I. Balitsky and L.N. Lipatov, The Pomeranchuk Singularity in Quantum Chromodynamics, Sov. J. Nucl. Phys. 28 (1978) 822 [ INSPIRE ].
4. L.V. Gribov, E.M. Levin and M.G. Ryskin, Semihard Processes in QCD, Phys. Rept. 100 (1983) 1 [ INSPIRE ].
5. A.H. Mueller and J.-w. Qiu, Gluon Recombination and Shadowing at Small Values of x, Nucl. Phys. B 268 (1986) 427 [ INSPIRE ].