1. J. Voit, Rep. Prog. Phys. 58, 977 (1995).
2. M. P. A. Fisher and L. I. Glazman, in Mesoscopic Electron Transport, Ed. by L. L. Sohn, L. Kouwenhoven, and G. Schön (Kluwer Academic, Dordrecht, 1997).
3. H. J. Schulz, G. Cuniberti, and P. Pieri, Field Theories for Low-Dimensional Condensed Matter Systems (Springer, Berlin, 2000); cond-mat/9807366.
4. F. D. M. Haldane, J. Phys. C 14, 2585 (1981).
5. G. Grüner, Density Waves in Solids (Addison-Wesley, Reading, 1994).