One impurity effect of Tm in YSe. Kondo effect and Van Vleck behavior A. Berger, P. Haen, F. Holtzberg, F. Lapierre, J.M. Mignot, T. Penney, O. Peña and R. Tournier J. Phys. Colloques, 40 C5 (1979) C5-364-C5-365 DOI: 10.1051/jphyscol:19795129