TY  - RPRT
TI  - Change of the isotopic abundance ratio within a sphere due to diffusion
AU  - Jim T. Bracken
AU  - F. E. Senftle
PY  - 1953
DO  - 10.3133/tei402
UR  - https://pubs.usgs.gov/publication/tei402
ID  - tei402
ER  -