@article{NUMA_1991__59_8_133573,
     author = {R. Meyer-Spasche and Bengt Fornberg},
     title = {Discretization errors at free boundaries of the {Grad-Schl\"uter-Shafranov} equation.},
     journal = {Numerische Mathematik},
     pages = {683--710},
     publisher = {mathdoc},
     volume = {59},
     number = {8},
     year = {1991},
     zbl = {0737.65092},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1991__59_8_133573/}
}