Rappaz, J.2006-08-242006-08-242006-08-24198410.1007/BF01379665https://infoscience.epfl.ch/handle/20.500.14299/233669WOS:A1984TS10600007Approximation of a Nondifferentiable Nonlinear Problem Related to Mhd Equilibriatext::journal::journal article::research article