Hyperlogarithms and periods in Feynman amplitudes
  The role of hyperlogarithms and multiple zeta values (and their generalizations) in Feynman amplitudes is being gradually recognized since the mid 1990's. The present lecture provides a concise introduction to a fast developing subject that attracts the interests of a wide range of specialists - from number theorists to particle physicists. 
Ivan Todorov
math-ph hep-th math.MP physics.hist-ph