@article{MAN_1910__69_158473,
     author = {Friedrich Riesz},
     title = {Untersuchungen \"uber {Systeme} integrierbarer {Funktionen}},
     journal = {Mathematische Annalen},
     pages = {449--497},
     publisher = {mathdoc},
     volume = {69},
     year = {1910},
     zbl = {41.0383.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1910__69_158473/}
}