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TY - `JOUR` AU - Greule, Markus AU - Keppler, Frank TI - Methyl sulfates as methoxy isotopic reference materials for [delta]13C and [delta]2H measurements PY - 2019 LA - eng SP - 8 S. T2 - Rapid communications in mass spectrometry PY - 2019 VL - 33 SI - 4 SP - 343-350 DO - 10.1002/rcm.8355 AN - UBHD-68359307 ER -