TI - Isotopic carbon: Techniques in its measurement and chemical manipulation PT - JOUR DP - 1949 TA - Journal of the American Medical Association pages = {105}, VI - 141 IP - 1 AID - 10.1001/jama.1949.02910010107023 [doi] 4100 - http://dx.doi.org/10.1001/jama.1949.02910010107023 SO - Journal of the American Medical Association September 3, 1949 141(1):105