1. F. Joliot, in Le Cyclotron, Editions de la Revue d’Optique, Theoretique et Instrumentale (1945), Foreword; in Cyclotron, Ed. by P. A. Cherenkov (OTIZ, GITTL, Moscow, Leningrad, 1948).
2. E. O. Lawrence, and N. E. Edelfsen, Science 72, 376, (1930).
3. E. O. Lawrence and M. S. Livingston, Phys. Rev. 37, 1707 (1931).
4. E. O. Lawrence and M. S. Livingston, Phys. Rev. 40, 19 (1932).
5. E. O. Lawrence and M. S. Livingston, Phys. Rev. 42, 1950 (1932).