@article{NUMA_1977__29_132530,
     author = {H.J. Stetter},
     title = {The {Defect} {Correction} {Principle} and {Discretization} {Methods.}},
     journal = {Numerische Mathematik},
     pages = {425--444},
     publisher = {mathdoc},
     volume = {29},
     year = {1977},
     zbl = {0362.65052},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1977__29_132530/}
}