title: Isotope ratio measurements: new developments and applications.
authors: Klaus G
authors: KG
authors: Heumann
authors: Torsten C
authors: TC
authors: Schmidt
mesh_terms: D002247:Carbon Isotopes / Q000032:analysis; D007553:Isotope Labeling / Q000379:methods; D007554:Isotopes / Q000032:analysis*; D013058:Mass Spectrometry / Q000379:methods*; D009587:Nitrogen Isotopes / Q000032:analysis
chemical_list: D002247:Carbon Isotopes; D007554:Isotopes; D009587:Nitrogen Isotopes