Physics goals and parameters of photon colliders
  Linear colliders offer a unique possibility to study gamma gamma and gamma electron interactions at the energies 0.1--2 TeV. This option is now included in design reports of NLC, JLC and TESLA/SBLC. This paper includes: status of photon colliders, new possibilities in study of Higgs boson, ways to achieve high luminosities. 
Valery Telnov (Institute of Nuclear Physics, Novosibirsk, Russia)