1. W. Bao, P.G. Pagliuso, J.L. Sarrao, J.D. Thompson, Z. Fisk, J.W. Lynn, R.W. Erwin, Phys. Rev. B 67, 099903 (2003)
2. H. Hegger, C. Petrovic, E.G. Moshopoulou, M.F. Hundley, J.L. Sarrao, Z. Fisk, J.D. Thompson, Phys. Rev. Lett. 8, 4986 (2000)
3. T. Mito, S. Kawasaki, G.-Q. Zheng, Y. Kawasaki, K. Ishida, Y. Kitaoka, D. Aoki, Y. Haga, Y. $$\bar{\rm O}$$nuki, Phys. Rev. B 63, 220507 (2001)
4. T. Muramatsu, N. Tateiwa, T.C. Kobayashi, K. Shimizu, K. Amaya, D. Aoki, H. Shishido, Y. Haga, Y. $$\bar{\rm O}$$nuki, J. Phys. Soc. Jpn. 70, 3362 (2001)
5. G. Knebel, M.-A. Méasson, B. Salce, D. Aoki, D. Braithwaite, J.P. Brison, J. Flouquet, J. Phys.: Condens. Matter 16, 8905 (2004)