1. Z. N. C. Ha, Nucl. Phys. B 435, 604 (1995).
2. F. D. M. Haldane, in Correlation Effects in Low- Dimensional Electron Systems, Ed. by A. Okiji and N. Kawakami (Springer, 1995), p. 3.
3. A. P. Polychronakos, Phys. Rev. Lett. 69, 703 (1992)
4. A. P. Polychronakos, J. Phys. A 39, 12793 (2006).
5. G. J. Heckman, in Harmonic Analysis on Reductive Groups, Ed. by W. H. Barker and P. J. Sally, Progress in Mathematics}, Vol. 101 (Birkhäuser, 1991), p. 181.