1. Die Isotopenzusammensetzung von natürlichem Kalzium;Hirt;Helv. Phys. Acta,1964
2. Search for natural variations in calcium isotope abundances;Stahl;Earth Planet. Sci. Letters,1968
3. Variations in ratio 48Ca/40Ca sum in natural materials;Corless;Pure Appl. Chem.,1965
4. Mass spectrometric determination of calcium isotope variations;Miller;Geochemistry International,1966
5. Ca40/Ca44 and O18/O16 isotopic ratios in some calcareous rocks;Artemov;Geochemistry International,1966