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We report on our calculation of the energy and angular dependence of the cross sections for the production of various particles by two-photon annihilation processes in e^+e^- and e^-e^- colliding beams. For beam energy E of more than 1 GeV, these cross sections ^4 (lnE) ^3 become increasingly more important than the usual one-photon cross sections ^2 (E) ^-2 for hadron production.
Brodsky et al. (Mon,) studied this question.