@article{MAN_1927__96_159160,
     author = {St. Kaczmarz},
     title = {\"Uber {Reihen} von allgemeinen {Orthogonalfunktionen}},
     journal = {Mathematische Annalen},
     pages = {148--151},
     publisher = {mathdoc},
     volume = {96},
     year = {1927},
     zbl = {52.0276.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1927__96_159160/}
}