Interactions and dynamical systems of type (n,m) - A case study
  We prove that the C*-algebra of the universal (n,m)-dynamical system may be obtained, up to Morita-Rieffel equivalence, as the crossed-product relative to an interaction on a commutative C*-algebra. The interaction involved is shown not to be part of an interaction group. 
Ruy Exel
math.OA math.DS