@article{JRAM_1977__292_151874,
     author = {Peter Roquette},
     title = {A criterion for rational places over local fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {90--108},
     publisher = {mathdoc},
     volume = {292},
     year = {1977},
     zbl = {0346.14009},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1977__292_151874/}
}