1. Breitmaier, E., Spohn, K.-H., Berger, S.: 13C spin-lattice relaxation times and the mobility of organic molecules in solution. Angew. Chem. Int. Ed. Engl. 14, 144–159 (1975)
2. Wehrli, F.W., Wirthlin, T.: Interpretation of carbon-13 NMR spectra, Chapt. 4. Heyden & Son, Ltd., London (1978)
3. Kalinowski, H.-O., Berger, S., Braun, S.: Carbon-13 NMR spectroscopy, Chapt. 5, pp. 621–649. Wiley, Chichester (1988)
4. Levy, G.C., Lichter, R.L., Nelson, G.L.: Carbon-13 nuclear magnetic resonance-spectroscopy, 2nd ed., Chapts. 1 and 9. Wiley, New York (1980)
5. Breitmaier, E., Voelter, W.: Carbon-13 NMR spectroscopy—high-resolution methods and applications in organic chemistry and biochemistry, 3rd rev. edn., Chapt. 3.3. VCH Publishers, Weinheim (1990)