BISTABLE BEHAVIOUR OF AN ELECTRON PARAMAGNETIC RESONANCE SPECTROMETER M. CACCHIANI, M. GIORDANO, M. MARTINELLI, L. PARDI et S. SANTUCCI J. Phys. Colloques, 49 C2 (1988) C2-169-C2-172 DOI: 10.1051/jphyscol:1988240