@misc{MZ_1925__22_167843,
     title = {Khintchine. {A.,} {Zwei} {Bemerkungen} zu einer {Arbeit} des {Herrn} {Perron}},
     journal = {Mathematische Zeitschrift},
     pages = {274--284},
     publisher = {mathdoc},
     volume = {22},
     year = {1925},
     zbl = {51.0157.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1925__22_167843/}
}