Magnetic equations with FreeFem++: The Grad-Shafranov equation & the current holeErwan Deriaz, Bruno Despres, Gloria Faccanoni, Kirill Pichon Gostaf, Lise-Marie Imbert-Gérard, Georges Sadaka and Remy SartESAIM: Proc., 32 (2011) 76-94DOI: https://doi.org/10.1051/proc/2011013