1. Abundances of uranium, thorium, and potassium;Clark,1966
2. Uranium and barium in stone meteorites;Hamaguchi;Geochim. Cosmochim. Acta,1957
3. Radioactive heat production in eclogite and some ultramafic rocks;Tilton,1963
4. The age of rocks and minerals;Davis;Carnegie Inst. Wash. Yearbook,1956
5. Comparative uranium and thorium analyses of basic and ultrabasic rocks;Lovering;Nature,1963