@article{JRAM_1990__404_153201,
     author = {G\"unter Lettl},
     title = {The ring of integers of an abelian number field.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {162--170},
     publisher = {mathdoc},
     volume = {404},
     year = {1990},
     zbl = {0703.11060},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1990__404_153201/}
}