Milligan, D. E.; Jacox, M. E. (1971). "Infrared Spectrum and Structure of Intermediates in Reaction of OH with CO". Journal of Chemical Physics54 (3): 927–942. doi:10.1063/1.1675022. Bibcode: 1971JChPh..54..927M.
The value is pKa = −0.2 ± 0.1. Jeevarajan, A. S.; Carmichael, I.; Fessenden, R. W. (1990). "ESR Measurement of the pKa of Carboxyl Radical and Ab Initio Calculation of the Carbon-13 Hyperfine Constant". Journal of Physical Chemistry94 (4): 1372–1376. doi:10.1021/j100367a033.
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Milligan, D. E.; Jacox, M. E. (1971). "Infrared Spectrum and Structure of Intermediates in Reaction of OH with CO". Journal of Chemical Physics54 (3): 927–942. doi:10.1063/1.1675022. Bibcode: 1971JChPh..54..927M.
