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Data on A's and K~ produced in central nucleus -nucleus collisions (C-C, C-Ne, O-Ne, C-Cu, C-Zr, C-Pb, O-Pb) at a 4.5 GeV/c momentum per incident nucleon obtained in the streamer chamber spectrometer SKM-200, are presented. Multiplicities, transverse momenta, rapidities and other characteristics are considered and compared with those for inelastic He-Li interactions. The polarization of A's was found to be consistent with zero. The upper limit of fl/A production ratio was estimated to be ~ 10 -2 with a 90 % confidence level. The results are compared with data of other experiments and some model calculations.

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