A superformula for neutrinoless double beta decay II: The short range   part
  A general Lorentz-invariant parameterization for the short-range part of the 0vBB decay rate is derived. Combined with the long range part already published this general parameterization in terms of effective B-L violating couplings allows one to extract the 0vBB limits on arbitrary lepton number violating theories. 
H. P\"as, M. Hirsch, H.V. Klapdor-Kleingrothaus, S.G. Kovalenko