Doubly charged Higgs through photon photon collisions in 3-3-1 models
  We study the production and signatures of doubly charged Higgs bosons in the process \gamma\gamma H^{- -} H^{++} at the e^-e^+ International Linear Collider and CERN Linear Collider, where the intermediate photons are given by the Weizs[a\ddot]cker-Willians and laser backscattering distributions. 
J. E. Cieza Montalvo, Nelson V. Cortez and M. D. Tonasse