1. Kyker, G. C., and Anderson, E. B. (ed.), “Rare Earths in Biochemical and Medical Research”, U.S.A.E.C. Rep., ORI NS-12 (1956).
2. Hunter, H. F., and Ballou, N. E., Nucleonics, 9 (5), C2–C7 (1951).
3. Kyker, G. C., Cress, E. A., Sivaramakrishnan, V. M., Steffee, C. H., and Stewart, M., Fed. Proc., 16, 207 (1957).
4. Steidle, H., “Seltene Erdmetalle”, in Heffter, A., and Heubner, W., “Handbuch d. experiment. Pharmakologie”, 3 (Pt. 4), 2189 (1935).
5. Snyder, F., Cress, E. A., and Kyker, G. C., J. Lipid Res., 1, 125 (1959).