| http://www.w3.org/ns/prov#value | - m is between 0 and 180, preferably between 0 and 125 h is between 15 and 200, preferably between 37 and 180, subject to the proviso that n???m; M is an alkali metal, preferably Na or K and particularly preferably Na; r is 0 or 1, or mixtures thereof.
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