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TY - `JOUR` AU - Keppler, Frank AU - Greule, Markus TI - Measurements of 13C/12C methane from anaerobic digesters : comparison of optical spectrometry with continuous-flow isotope ratio mass spectrometry PY - 2010 LA - eng SP - 7 S. T2 - Environmental science & technology PY - 2010 VL - 44 SI - 13 SP - 5067-5073 DO - 10.1021/es100460d AN - UBHD-67837636 ER -