@article{doi:10.1001/jama.1949.02900400048023,
author = {Sisson MA},
title = {FRee isotopes},
journal = {Journal of the American Medical Association},
volume = {140},
number = {5},
pages = {494},
year = {1949},
doi = {10.1001/jama.1949.02900400048023},
URL = { + http://dx.doi.org/10.1001/jama.1949.02900400048023},
eprint = {/data/Journals/JAMA/7604/jama_140_5_023.pdf}
}