1. Proceedings of the Small-x Workshop, held at DESY, May 1990 (ed.A.Ali and J.Bartels), Nucl.Phys.B (Proc.Suppl.), 18C, 1991.
2. For general reviews on perturbative QCD see, e.g.: H.D.Politzer, Phys.Rep. 14C, 129(1974);
3. C.H.Llewellyn Smith, Schladming Lectures 1987, Acta Phys.Austr. Suppl.XIX,331(1978);
4. Yu.Dokshitzer, D.I.Dyakonov, S.LTroyan, Phys.Rep. 58, 269(1980);
5. E.Reya, Phys.Rep. 69, 195(1981);