1. For a general review see, for example, (a) and in Topics in Carbon-13 NMR Spectroscopy, Edited by Vol. 2, p. 81. Wiley-Interscience, New York (1976);
2. Carbon-13 nuclear magnetic resonance spectroscopy of naturally occurring substances. Alkaloids
3. (d) Carbon-13 NMR Spectroscopy. Academic Press, New York (1972).
4. (a) D. Phil Thesis, University of Oxford (1970);