Contact Interactions with Polarized Beams at HERA
  The discovery potential of the HERA collider, with and without polarized beams, for electron-quark contact interactions in neutral current scattering is reviewed. The measurement of spin asymmetries in the polarized case could give crucial information on the chiral structure of new interactions. 
J.Kalinowski, H. Spiesberger, J.M.Virey