On a signature at next high energy electron-positron colliders F. M. L. Almeida, Y. A. Coutinho, J. A. Martins Simões, A. J. Ramalho, S. Wulck and M. A. B. do Vale Eur. Phys. J. C, 44 1 (2005) 127-130 Published online: 15 September 2005 DOI: 10.1140/epjc/s2005-02339-1