Neutrino Decay and Neutrinoless Double Beta Decay in a 3-3-1 Model
  In this work we show that the implementation of spontaneous breaking of the lepton number in the 3-3-1 model with right-handed neutrinos gives rise to fast neutrino decay with majoron emission and generates a bunch of new contributions to the neutrinoless double beta decay. 
Alex G. Dias, A. Doff, C. A. de S. Pires, P. S. Rodrigues da Silva