T.A. Armstrong, M. Benayoun, W. Beusch, I J. Bloodworth, M. Caponero, et al.. Observation of double $\Phi$-meson production in the central region for the reaction $pp \rightarrow p_{f}$(K$^{+}$K$^{-}$K$^{+}$K$^{-}$)p$_{s}$ at 300 GeV/c.
Physics Letters B, Elsevier, 1989, 221, pp.221-226.
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