A FREQUENCY DEPENDENT "LEVEL CROSSING" RESONANCE IN THULIUM NICOTINATE DIHYDRATE J. M. Baker, B. Bleaney, M. I. Cook, P. M. Martineau, M. R. Wells et C. A. Hutchison Jr. J. Phys. Colloques, 49 C8 (1988) C8-1515-C8-1516 DOI: 10.1051/jphyscol:19888698