http://www.w3.org/ns/prov#value | - Preferably, the precursor compounds useful in this invention are of the formula M(NR.sup.1R.sup.2).sub.x(NR.sup.3).sub.y (Formula I), wherein M is a metal, R.sup.1, R.sup.2 and R.sup.3 are each independently a hydrogen or an organic group (as
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