Results on the branching ratio $\Gamma ( \rho \rightarrow \mu + \mu ) / \Gamma ( \rho \rightarrow \pi + \pi$) obtained from measuring the reactions $\pi^{-} + LiH \rightarrow \mu^{+} + \mu^{-}$ ... $\pi^{-} + LiH \rightarrow \pi^{+} + \pi^{-} + ...$ with 11.2 GeV/c incident $\pi^{-}$ mesons

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