Ott, U. Cosmochemistry, Max Planck Institute for Chemistry, Max Planck Society;
Podosek, F. A., Nichols Jr., R. H., Brannon, J. C., Meyer, B. S., Ott, U., Jennings, C. L., et al. (2000). Potassium, stardust and the last supernova. Geochimica et Cosmochimica Acta, 64, 2351-2362.