Quartic Gauge Boson Couplings and Tree Unitarity in the SU(3)_C X   SU(3)_L X U(1)_N Models
  The quartic gauge boson couplings in the ${SU(3)}_C \otimes {SU(3)}_L \otimes {U(1)}_N$ models are presented. We find that the couplings of four {\it differrent} gauge bosons may have unusual Lorentz structure and the couplings sastify the tree unitarity requirement at high energy limit. 
D. T. Binh, D. T. Huong, Tr. T. Huong, H. N. Long and D. V. Soa