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Mark L. Gourari andAnatolyi A. Liberman
"Refractometer for measurement of methane concentration in the atmosphere", Proc. SPIE 3543, Precision Agriculture and Biological Quality, (14 January 1999); https://doi.org/10.1117/12.336884
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Mark L. Gourari, Anatolyi A. Liberman, "Refractometer for measurement of methane concentration in the atmosphere," Proc. SPIE 3543, Precision Agriculture and Biological Quality, (14 January 1999); https://doi.org/10.1117/12.336884