@article{MZ_1971__120_171517,
     author = {Eberhard Schock},
     title = {\"Uber die {Konvergenzgeschwindigkeit} projektiver {Verfahren.}},
     journal = {Mathematische Zeitschrift},
     pages = {148--156},
     publisher = {mathdoc},
     volume = {120},
     year = {1971},
     zbl = {0202.15004},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__120_171517/}
}