| http://www.w3.org/ns/prov#value | - The above compounds may be contacted in the presence of another reaction agent such as silicon, phosphorus or aluminum. [0037] Several examples of the method of producing the solid titanium catalyst component (A) are briefly described below. [0038] (1) The magnesium compound or the complex of the magnesium compound optionally with the internal electron donor, is reacted with the titanium compound
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