@article{NUMA_1964__6_131609,
     author = {J.E. GUNN},
     title = {On the {Two-Stage} {Iterative} {Method} of {Douglas} for {Mildly} {Nonlinear} {Elliptic} {Difference} {Equations.}},
     journal = {Numerische Mathematik},
     pages = {243--249},
     publisher = {mathdoc},
     volume = {6},
     year = {1964},
     zbl = {0131.14903},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1964__6_131609/}
}