| http://www.w3.org/ns/prov#value | - esent in the production fluid as a basis for the calculation.In another aspect, the present invention is a method for determining the extent of recovery of a material of interest injected into an oil well or a subsurface formation associated with a bore of the oil well comprising the steps of: a) introducing a material of interest into the oil well or into the subsurface formation associated with
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