@article{MZ_1930__31_168160,
     author = {K. Knopp},
     title = {Zur {Theorie} der {Limitierungsverfahren.} {Erste} {Mitteilung}},
     journal = {Mathematische Zeitschrift},
     pages = {97--127},
     publisher = {mathdoc},
     volume = {31},
     year = {1930},
     zbl = {55.0730.07},
     url = {http://geodesic.mathdoc.fr/item/MZ_1930__31_168160/}
}