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- [22] HIGH-PRECISION DIRECT MEASUREMENTS OF (CH4)-C-13/(CH4)-C-12 AND (CH3D)-C-12/(CH4)-C-12 RATIOS IN ATMOSPHERIC METHANE SOURCES BY MEANS OF A LONG-PATH TUNABLE DIODE-LASER ABSORPTION SPECTROMETER APPLIED OPTICS, 1994, 33 (33): : 7704 - 7716