THE FIELD UP-DOWN MODEL AND ITS APPLICATION TO PARAMAGNETIC RELAXATION IN YbCl3.6H2OH. Winkler, P. Alwardt et E. GerdauJ. Phys. Colloques, 40 C2 (1996) C2-250-C2-252DOI: https://doi.org/10.1051/jphyscol/1979250
