| http://www.w3.org/ns/prov#value | - They cite bis(cyclopentadienyl) dichloro-transition metal, bis(cyclopentadienyl)methyl, chloro-transition metal, and bis(cyclopentadienyl) dimethyl-transition metal as examples of metallocene catalysts, where the metals include choices such as titanium, zirconium, hafnium, and vanadium.
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