@article{NUMA_1976__27_132457,
     author = {K. Witsch},
     title = {Konvergenzaussagen f\"ur {Projektionsverfahren} bei linearen {Operatoren.}  - {Convergence} of {Projection} {Methods} for {Linear} {Operators.}},
     journal = {Numerische Mathematik},
     pages = {339--354},
     publisher = {mathdoc},
     volume = {27},
     year = {1976},
     zbl = {0336.65031},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1976__27_132457/}
}