The 3-3-1 model with S 4 flavor symmetry P.V. Dong, H.N. Long, D.V. Soa and V.V. Vien Eur. Phys. J. C, 71 2 (2011) 1544 Published online: 01 February 2011 DOI: 10.1140/epjc/s10052-011-1544-2