| http://www.w3.org/ns/prov#value | - Therefore, an object of the present invention is a process for the preparation of an ethylene polymer, which comprises the polymerization reaction of ethylene in the presence of a catalyst comprising a stereorigid metallocene compound of a transition metal belonging to the Group IIIb, IVb, Vb, VIb or of Lanthanides of the Periodic Table of the Elements, having two substituted cyclopentadienyl liga
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