On the tensor reduction of one-loop pentagons and hexagons
  We perform analytical reductions of one-loop tensor integrals with 5 and 6 legs to scalar master integrals. They are based on the use of recurrence relations connecting integrals in different space-time dimensions. The reductions are expressed in a compact form in terms of signed minors, and have been implemented in a mathematica package called hexagon.m. We present several numerical examples. 
T. Diakonidis (1), J. Fleischer (1 and 2), J. Gluza (3), K. Kajda (3),   T. Riemann (1), J.B. Tausk (1) ((1) DESY, Zeuthen, ...