1. Gasiorowicz, S. Quantum Physics, Wiley 1974.
2. Van Gunsteren, W.F. and Berendsen, H.J.C. Angew.Chem., Int. Ed. Engl.
29 (1990) 992.
3. Szabo,A. and Ostlund, N.S., Modern Quantum Chemistry, Macmillan, New York (1982) p. 144.
4. Mavri, J., Berendsen, H.J.C. and Van Gunsteren, W.F., J. Phys. Chem.
97 (1993) 13469.
5. Ernst, R.R., Bodenhausen, G. and Wokaun, A., Principles of magnetic resonance in one and two dimensions, Clarendon Press, Oxford, 1987.