1. D. S. Billington, J. H. Crawford, Jr.: Radiation Damage in Solids University Press, (Princeton NJ 1961)
2. R. R. Coltman, C. E. Klabunde, J. K. Redman: J. Appl. Phys. 33, 3509 (1962)
3. E. Segre: Nuclei and Particles (Benjamin, New York 1965)
4. N. Bohr: K. Dan. Vidensk. Selsk, Mat. Fys. Medd. 18, No. 8 (1948)
5. O. Hahn: Naturwiss. 17, 296 (1929)