@article{MAN_1916__77_158742,
     author = {W. K\"ustermann},
     title = {Funktionen von beschr\"ankter {Schwankung} in zwei reellen {Ver\"anderlichen.}},
     journal = {Mathematische Annalen},
     pages = {474--481},
     publisher = {mathdoc},
     volume = {77},
     year = {1916},
     zbl = {46.0432.04},
     url = {http://geodesic.mathdoc.fr/item/MAN_1916__77_158742/}
}