@article{MZ_1920__8_167590,
     author = {St. Jolles},
     title = {Einfache {Kennzeichen} polarer {Korrelationen}},
     journal = {Mathematische Zeitschrift},
     pages = {91--95},
     publisher = {mathdoc},
     volume = {8},
     year = {1920},
     zbl = {47.0555.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1920__8_167590/}
}