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• To appreciate these special cases one must resort to quantum theory.

• Recourse was made (or We resorted, or We made recourse) to a propulsion unit incorporating ...

• The 19th century industrialists resorted to a two-step combustion process in order to ensure that ...

• Again gas chromatography and mass spectrometry were called on, and they revealed that ...

• Because of this, recourse to much simpler models is often necessary [or it is often necessary to take (or have) recourse to much simpler models].

• The thermal reservoir will be called upon to supply this heat.

• We resorted to the trial-and-error procedure.