title: Improvements in mass spectrometers for the measurement of small differences in isotope abundance ratios.
authors.forename: C R
authors.initials: CR
authors.lastname: McKINNEY
authors.forename: J M
authors.initials: JM
authors.lastname: McCREA
authors.forename: S
authors.initials: S
authors.lastname: EPSTEIN
authors.forename: H A
authors.initials: HA
authors.lastname: ALLEN
authors.forename: H C
authors.initials: HC
authors.lastname: UREY
mesh_terms: D007554:Isotopes; D013058:Mass Spectrometry; D013057:Spectrum Analysis / Q000295:instrumentation*
chemical_list: D007554:Isotopes