A Strong Electroweak Sector at Future Linear Colliders
  An effective lagrangian describing a strong interacting electroweak sector is considered. It contains new vector and axial-vector resonances all degenerate in mass and mixed with $W$ and $Z$. The model, for large mass of these degenerate gauge bosons, becomes identical to the standard model in the classical limit of infinite Higgs mass. The limits on the parameter space of this model from future $e^+e^-$ colliders are presented. 
R.Casalbuoni, A.Deandrea, S.De Curtis, D.Dominici, R.Gatto and   M.Grazzini