1. G.R. Luckhurst and G.W. Gray eds., “The Molecular Physics of Liquid Crystals”, Academic Press, (1979).
2. J.W. Emsley, J.C. Lindon, “NMR Spectroscopy Using Liquid Crystal Solvents”, Pergamon, (1965).
3. P. Diehl and C.L. Khetrapal in “NMR Basic Principles and Progress”, P. Diehl, E. Fluck and R. Kosfeld eds., Vol. 1, Springer-Verlag (1969).
4. J.W. Doane, in “Magnetic Resonance of Phase Transitions”, F.J. Owens, C.J. Poole Jr. and H.A. Farach, Academic Press (1979).
5. C. Zannoni, Chap. 9 in “The Molecular Physics of Liquid Crystals”, G.R. Luckhurst and G.W. Gray eds., Academic Press (1979) and refs. therein.