1. P. Coleman, Handbook of Magnetism and Advanced Magnetic Materials, vol. 1 (Wiley, New York, 2007). cond-mat/0612006
2. Y. Nakajima, H. Shishido, H. Nakai, T. Shibauchi, K. Behnia, K. Izawa, M. Hedo, Y. Uwatoko, T. Matsumoto, R. Settai, Y. Onuki, H. Kontani, Y. Matsuda, J. Phys. Soc. Jpn. 76, 027403 (2007)
3. K. Izawa, H. Yamaguchi, Y. Matsuda, H. Shishido, R. Settai, Y. Onuki, Phys. Rev. Lett. 87, 057002 (2001)
4. H. Aoki, T. Sakakibara, H. Shishido, R. Settai, Y. Onuki, P. Miranovic, K. Machida, J. Phys. Condens. Matter 16, L13 (2004)
5. Y. Nakajima, K. Izawa, Y. Matsuda, S. Uji, T. Terashima, H. Shishido, R. Settai, Y. Onuki, H. Kontani, J. Phys. Soc. Jpn. 73, 5 (2004)