Natural variations in the nitrogen isotope abundance ratio in igneous rocks

Improvements in Mass Spectrometers for the Measurement of Small Differences in Isotope Abundance Ratios

1950 • 696 citations

Natural variations in the relative abundances of the nitrogen isotopes

1957 • 35 citations

Abundance of N ¹⁵ in the Nitrogen Occluded in Radioactive Minerals

1950 • 11 citations