@misc{indiciae39ad3319bde6, title = {Letter: Isotopic stedy-state requirements.}, author = {E N Siguel}, year = {1975}, doi = {10.1016/0014-4800(75)90086-6}, url = {https://pubmed.ncbi.nlm.nih.gov/1126430/}, note = {Source identifier: 1126430} }