1. Mason, J. (1987) ‘Nitrogen’, chap. 12 in J. Mason (ed.), Multinuclear NMR, Plenum, New York, pp. 335–367.
2. Duncan, T.M. (1990), A Compilation of Chemical Shift Anisotropies, Farragut Press, Chicago, N1–9.
3. Theoretical and physical aspects of nuclear shielding, including shielding tensors, are surveyed annually by Jameson, C.J., chap. 1 in G.A. Webb (ed.), Nuclear Magnetic Resonance: a Specialist Periodical Report, The Royal Society of Chemistry. A later chapter surveys solid state NMR.
4. Power, W.P and Wasylishen, R.E. (1991), Annu. Rep. NMR Spectrosc. 23, 1.
5. Hartzell, C.J., Pratum, T.K andd Drobny, G. (1987), J. Chem. Phys. 87, 4324.