We report the first measurement of the differential cross section for the process gamma gamma -> eta eta in the kinematic range above the eta eta threshold, 1.096 GeV < W < 3.8 GeV over nearly the entire solid angle range, vertical bar cos theta*vertical bar
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Olivier Schneider, Yiming Li, Mingkui Wang, Chao Wang, Donghyun Kim, Xiao Wang, Lei Li