@article{JRAM_1932__167_149807,
     author = {Tonio Rella},
     title = {\"Uber {Abelsche} {Operatorgruppen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {235--247},
     publisher = {mathdoc},
     volume = {167},
     year = {1932},
     zbl = {0003.19603},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1932__167_149807/}
}