| http://www.w3.org/ns/prov#value | - A preferred class ofthe organic phosphorus esters may be represented by the following general formula: where X, Y and Z represent H or lower aliphatic hydrocarbon radicals such as methyl, ethyl, isopropyl and butyl but maynot all be --H at the same time, and m, n, and o are 1, 2 or 3. u Another preferred class oforganic phosphorus esters for our purpose are the normally liquid long chain aliphatic
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