| http://www.w3.org/ns/prov#value | - Thus, in an especially preferred embodiment of the present invention, the solid catalyst component is prepared by a process comprising: preparing a solution of magnesium complex by reacting an alkoxy magnesium compound and an electron donor or precursor thereof in a C6-C10 aromatic liquid reaction medium; reacting said magnesium complex with a compound of at least one fourvalent Group 4 metal at a
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