High magnetic field properties and ESR of the Li1-zNi1+zO2compounds A.-L. Barra, G. Chouteau, A. Stepanov, A. Rougier and C. Delmas Eur. Phys. J. B, 7 4 (1999) 551-562 Published online: 15 February 1999 DOI: 10.1007/s100510050648