@article{MZ_1921__9_167621,
     author = {G., Szeg\"o},
     title = {Beitr\"age zur {Theorie} der {Toeplitzschen} {Forman}},
     journal = {Mathematische Zeitschrift},
     pages = {167--190},
     publisher = {mathdoc},
     volume = {9},
     year = {1921},
     zbl = {47.0391.04},
     url = {http://geodesic.mathdoc.fr/item/MZ_1921__9_167621/}
}