1. Cases of unbalanced Ar/K ratios in biotites and their relevance to the establishment of an absolute geological time-scale;Afanas'yev;Izv. Akad. Nauk S.S.S.R., Ser. Geol.,1963
2. The comparative geochemistry of potassium, rubidium, calcium, argon, strontium, uranium, thorium and lead;Ahrens,1965
3. Geochronology by radioactive decay;Aldrich;Ann. Rev. Nucl. Sci.,1958
4. Half-life of87Rb;Aldrich;Phys. Rev.,1965