@article{JRAM_1952__190_150219,
     author = {G. Bergmann},
     title = {Periodische {Ketten} linearer {Transformationen.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {108--124},
     publisher = {mathdoc},
     volume = {190},
     year = {1952},
     zbl = {0046.04701},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1952__190_150219/}
}