Pure Appl. Chem., 1972, Vol. 32, No. 1-4, pp. 51-66
http://dx.doi.org/10.1351/pac197232010051
13C nmr spectroscopy: relaxation times of 13C and methods for sensitivity enhancement
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Pure Appl. Chem., 1972, Vol. 32, No. 1-4, pp. 51-66
http://dx.doi.org/10.1351/pac197232010051