1. Evidence for Bismuth-207 in Global Fallout;Aarkrog;Journal of Environmental Radioactivity,1983
2. Nickel-63 in Marine Terrestrial Biota, Soil and Sediments;Beasley,1969
3. Concentrations and Retention of Fallout Radionuclides in the Alaskan Arctic Ecosystem;Hanson,1967
4. Liquid Scintillation counting of Nickel-63;Harvey;International Journal of Applied Radiation and Isotopes,1970
5. Fall-out plutonium in Swedish reindeer lichens;Holm;Health Physics,1975