@article{NUMA_1964__6_131627,
     author = {W. OETTLI and W. PRAGER},
     title = {Compatibility of {Approximate} {Solution} of {Linear} {Equations} with {Given} {Error} {Bounds} for {Coefficients} and {Right-Hand} {Sides.}},
     journal = {Numerische Mathematik},
     pages = {405--409},
     year = {1964},
     volume = {6},
     zbl = {0133.08603},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1964__6_131627/}
}