1. Natural matrix standards;Bowen;Envir. Int.,1978
2. Spiked sample standards; their uses and disadvantages in analytical quality control;Bowen,1979
3. Boyd, H. (1979) Los Alamos Scientific Laboratory, NM, (Personal Communication).
4. Radiological Health Handbook;Department of Health Education and Welfare,1970
5. Time pattern of off-site plutonium contamination from Rocky Flats Plant by lake sediment analyses;Hardy,1978