J. Blietschau, H. Deden, H. Faissner, F.J. Hasert, W. Krenz, et al.. Evidence for the leptonic neutral current reaction $\bar{\gamma}_{\mu}^+e^- \rightarrow \bar{\gamma}_{\mu}^+e^-$.
Nuclear Physics B, Elsevier, 1976, 114, pp.189-198.
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