| http://www.w3.org/ns/prov#value | - in which R.sup.1 denotes an alkyl radical, e.g. of 1 to 6 carbon atoms, such as methyl or ethyl, and m is a number ranging from 2 to 40, preferably from 10 to 20, or a cyclic aluminoxane corresponding to the general formula: ##STR1## in which
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