Monodromy--like Relations for Finite Loop Amplitudes
  We investigate the existence of relations for finite one-loop amplitudes in Yang-Mills theory. Using a diagrammatic formalism and a remarkable connection between tree and loop level, we deduce sequences of amplitude relations for any number of external legs. 
N. E. J. Bjerrum-Bohr, Poul H. Damgaard, Henrik Johansson and Thomas   Sondergaard
hep-th