G.F. Krebs, J.F. Gilot, P.N. Kirk, G. Claesson, J. Miller, et al.. Subthreshold negative pions and energetic protons produced at $\theta_{cm}=900$ in 246 MeV/nucleon $^{139}$La + $^{139}$La collisions.
Physics Letters B, Elsevier, 1986, 171, pp.37-40.
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