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New bicenter metal-complex catalysts supported on dehydrated microspheric silica gel have been synthesized and tested in the polymerization of ethene and butadiene. The catalysts contain two components: a titanium-magnesium- or chromium-containing compound and an oligodienyl metal-aluminium complexes with a bridge structure (metal-Zr or Ni). A possibility of preparation of linear medium-density polyethylene...