Higher order corrections in perturbative quantum chromodynamicsW L VAN NEERVEN Instituut-Lorentz, Universiteit Leiden, PO Box 9506, 2300 RA Leiden, The Netherlands Abstract. We present some techniques which have been developed recently or in the recent past to compute Feynman graphs beyond one-loop order. These techniques are useful to compute the three-loop splitting functions in QCD and to obtain the complete second order QED corrections to Bhabha scattering. Keywords. Quantum chromodynamics; perturbation theory; higher order. Pacs No.12.38.-t; 12.38.Bx; 12.38.Cy |