Rare top decay t → cl+l− in economical 331 models R. Gaitán-Lozano, R. Martinez and J. H. Montes de Oca Y. Eur. Phys. J. Plus, 127 12 (2012) 158 Published online: 21 December 2012 DOI: 10.1140/epjp/i2012-12158-y