METAL-INSULATOR TRANSITION IN PYRITE TYPE NiS2-xSex SYSTEM T. Miyadai, Y. Tazuke, S. Kinouchi, T. Nishioka, S. Sudo, Y. Miyako, K. Watanabe et K. Inoue J. Phys. Colloques, 49 C8 (1988) C8-187-C8-188 DOI: 10.1051/jphyscol:1988880