@article{MZ_1920__6_167566,
     author = {O., Perron},
     title = {Zur {Theorie} der divergenten {Reihen}},
     journal = {Mathematische Zeitschrift},
     pages = {158--160},
     publisher = {mathdoc},
     volume = {6},
     year = {1920},
     zbl = {47.0197.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1920__6_167566/}
}