1. C.P. Slichter. “Principles ofMagnetic Resonance,” Harper, New York (1965) 1st edition.
2. the far wings of a spectral line will never have a lorentzian shape as otherwise the moments would diverge.
3. S.W. Lovesey in “Dynamics of Solids and Liquids by Neutron Scattering,”, edited by S.W. Lovesey and T. Springer, Springer, Berlin (1977).
4. Н. Mori, Progr. Theor. Phys. 33, 423 (1965).
5. D. Forster. “Hydrodynamic Fluctuations, Broken Symmetry, and Correlation Functions,” Benjamin, Reading (1975).