1. See for example: J. Seliger, Nuclear Quadrupole Resonance: Theory, in: J.C. Lindon, G.E. Tranter, J.L. Holmes (Eds.), Encyclopedia of Spectroscopy and Spectrometry; Academic Press, San Diego, 2000, pp. 1672–1680., 3rd Edition, J. C. Lindon, G. E. Tranter and D. Koppenaal (Eds.) 2017, Vol. 3 N-R, pp 447-455.
2. Sensitive detection of nuclear quadrupole interactions in solids;Slusher;Phys. Rev.,1968
3. Nuclear dipole field quenching of integer spins;Leppelmeier;Phys. Rev.,1966
4. 14N NQR spectroscopy of some amino acids and nucleic bases via double resonance in the laboratory frame;Blinc;J. Chem. Phys,1972
5. The Principles of Nuclear Magnetism;Abragam,1961