@article{NUMA_1989__54_3_133318,
     author = {V.I. Oliker and L.D. Prussner},
     title = {On the {Numerical} {Solution} of the {Equation} ....-(....) = f and {Its} {Discretizations,} {I.}},
     journal = {Numerische Mathematik},
     pages = {271--294},
     publisher = {mathdoc},
     volume = {54},
     number = {3},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1989__54_3_133318/}
}