Neutrino masses in the supersymmetric SU(3)C⊗SU(3)L⊗U(1)X model with right-handed neutrinos P.V. Dong, D.T. Huong, M.C. Rodriguez and H.N. Long Eur. Phys. J. C, 48 1 (2006) 229-241 Published online: 28 September 2006 DOI: 10.1140/epjc/s10052-006-0010-z