1. Carbon-13 NMR Spectroscopy, Academic Press, New York (1972).
2. For reviews of nitrogen NMR spectroscopy see (a) and 15N Magnetic Resonance Spectroscopy, in Nuclear Magnetic Resonance in Chemistry, ed. by Academic Press, New York (1965).
3. (b) and Nitrogen Nuclear Magnetic Resonance, in Progress in NMR Spectroscopy, vol. 6, p. 119. ed. by and Pergamon Press, Oxford (1970).
4. (c) and Nitrogen NMR Spectroscopy, in Annual Reports in NMR Spectroscopy, Vol. 5A, p. 395. ed by Academic Press, London (1972).
5. (d) 15N NMR Spectroscopy, in Determination of Organic Structures by Physical Methods, p. 195. ed. by and Academic Press, New York (1972).