Pair production of the heavy leptons in future high energy linear e+e- colliders Chong-Xing Yue, Nan Zhang and Shi-Hai Zhu Eur. Phys. J. C, 53 2 (2008) 215-219 Published online: 13 November 2007 DOI: 10.1140/epjc/s10052-007-0455-8