1. 66Cav: Cavin, O. B., Steele, R. M., Harris, L. A., and Yakel, H. L., ORNL-3970, Oak Ridge National Laboratory, Oak Ridge, TN (Oct 1966).
2. 67Fin: Finkel', V. A. and Vorob'ev, V. V.,Zh. Eksp. Teor. Fiz., 53, 1913 (1967); TR;Sov. Phys.—JETP, 26, 1086 (1968).
3. 67Mar: Markova, I. A., Terekhova, V. F., and Savitskii, E. M.,Izv. Akad. Nauk SSSR, Neorg. Mater., 3, 392 (1967); TR:Inorg. Materials, 3, 343 (1967).
4. 67Mcw: McWhan, D. B. and Stevens, A. L.,Phys. Rev., 154, 438 (1967).
5. 75Bel: Belovol, V. S., Finkel', V. A., and Sivokon', V. E.,Zh. Eksp. Teor. Fiz., 69, 1734 (1975) TR:Sov. Phys.—JETP, 42, 880 (1976).