New heavy charged leptons at future high energy electron-positron colliders F. M. L. Almeida Jr., Y. A. Coutinho, J. A. Martins Simões, S. Wulck and M. A. B. do Vale Eur. Phys. J. C, 30 3 (2003) 327-335 Published online: 05 September 2003 DOI: 10.1140/epjc/s2003-01298-9