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Signals for processes induced by QCD instantons are searched for in HERA data on the hadronic final state in deep-inelastic scattering. The maximally allowed fraction of instanton-induced events is found at 95% confidence level to be on the percent level in the kinematic domain 10 -4 x 10 -2 and 5 Q 2 100 GeV 2 . The most stringent limits are obtained...
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