M.J. Corden, J.D. Dowell, D. Eastwood, J. Garvey, R.J. Homer, et al.. Production of muon pairs in the continuum region by 39.5 GeV/c$\pi^{\pm}, K^[\pm}, p$ and $\bar p$ beams incident on a copper target.
Physics Letters B, Elsevier, 1978, 76, pp.226-230.
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