1. Observations of Radioactivity, No. 6 (Finnish Meteorological Office, Helsinki, 1967).
2. Nuclear Data Sheets (National Academy of Sciences-National Research Council).
3. Edvarson, K., Löw, K., and Sisefsky, J., Nature, 184, 1771 (1959).
4. Mamuro, T., Yoshikawa, K., and Maki, N., Health Physics, 11, 199 (1965).
5. Crocker, G. R., Kawahara, F. K., and Freiling, E. C., in Radioactive Fallout from Nuclear Weapons Tests (edit. by Klement, A. W.) (US Atomic Energy Commission, 1965).