References
- Arrachea , L. 2000 . Phys. Rev. , B62 : 10033
- Doucot , B. and Wen , X. G. 1989 . Phys. Rev. , B40 : 2719
- Gurin , P. and Gulácsi , ZS. 2001 . Phil. Mag. , B81 : 321
- Nagaoka , Y. 1966 . Phys. Rev. , 147 : 392
- Sütö , A. 1991a . Commun. math. Phys. , 140 : 43
- 1991b . Phys. Rev. , B43 : 8779
- Tasaki , H. 1989 . Phys. Rev. , B40 : 9192
- Thouless , D. J. 1965 . Proc. phys. Soc , 86 : 893
- Töth , B. 1991 . Lett. math. Phys. , 22 : 321