@article{MZ_1943__49_169039,
     author = {G. Lyra},
     title = {Zur {Theorie} der {C-} und {H-Summierbarkeit} negativer {Ordnung}},
     journal = {Mathematische Zeitschrift},
     pages = {538--562},
     publisher = {mathdoc},
     volume = {49},
     year = {1943},
     zbl = {0061.12401},
     url = {http://geodesic.mathdoc.fr/item/MZ_1943__49_169039/}
}