TY - GEN AU - Heumann,Klaus G AU - Schmidt,Torsten C TI - Isotope ratio measurements: new developments and applications SN - 1618-2650 PY - 2013///0819 KW - Carbon Isotopes KW - analysis KW - Isotope Labeling KW - methods KW - Isotopes KW - Mass Spectrometry KW - Nitrogen Isotopes N1 - Publication Type: Editorial; Introductory Journal Article UR - https://doi.org/10.1007/s00216-013-6705-8 ER -