Rappaz, J.2006-08-242006-08-242006-08-24197710.1007/BF01403854https://infoscience.epfl.ch/handle/20.500.14299/233651WOS:A1977DM38100002Approximation of Spectrum of a Non-Compact Operator Given by Mhd Stability of a Plasmatext::journal::journal article::research article