@article{NUMA_1974__23_132302,
     author = {D.A. S\^anchez},
     title = {An {Iteration} {Scheme} for {Boundary} {Value-Alternative} {Problems.}},
     journal = {Numerische Mathematik},
     pages = {223--230},
     publisher = {mathdoc},
     volume = {23},
     year = {1974},
     zbl = {0302.65051},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1974__23_132302/}
}