| http://www.w3.org/ns/prov#value | - It would be particularly desirable if such a determination could be made using an inexpensive and environmentally benign method.SUMMARY OF THE INVENTIONIn one aspect, the present invention is a method for determining the extent of recovery of materials injected into an oil well comprising the steps of: a) admixing a material to be injected into an oil well with a chemical tracer compound at a pred
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