| http://www.w3.org/ns/prov#value | - Also, it is possible to use, for the metallocene (h-3), a bridged metallocene in which at least two of R2, R3, R4 and R5 in the general formula (20), for example, R2 and R3, are a group (ligand) having a skeleton of cyclopentadienyl, wherein said at least two groups are bound together through a bridging group, such as an alkylene, substituted alkylene, silylene or substituted silylene.
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