Single top production in e+ e-, e- e-, and collisions E. Boos, M. Dubinin, A. Pukhov, M. Sachwitz and H.J. Schreiber Eur. Phys. J. C, 21 1 (2001) 81-91 Published online: 15 June 2001 DOI: 10.1007/s100520100733