@article{JRAM_1927__157_149627,
     author = {Alfred Loewy},
     title = {\"Uber abstrakt definierte {Transmutationssysteme} oder {Mischgruppen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {239--254},
     publisher = {mathdoc},
     volume = {157},
     year = {1927},
     zbl = {53.0112.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1927__157_149627/}
}