Perhaps you should try some spelling variations:
pollutants dispersion » pollutant dispersion, pollution dispersion, pollutants detection
dispersion relation » dispersion relations
dimensionality » dimensional

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• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"pollutant ((dimension reduction) OR (dimensionality reduction))\\") or (\\"pollutants dispersion relation\\"))\"".
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