INFLUENCE OF MAGNETIC FIELD ON THE EFFECTS PRECEEDING THE TRANSITION OF FIELD EMISSION INTO THE VACUUM BREAKDOWN G.N. Fursey, V.E. Ptytsin et N.V. Egorov J. Phys. Colloques, 40 C7 (1979) C7-403-C7-404 DOI: 10.1051/jphyscol:19797197