@article{MM2_1983__43_154946,
     author = {H. Zantema},
     title = {Global restrictions on ramification in number fields.},
     journal = {Manuscripta mathematica},
     pages = {87--106},
     publisher = {mathdoc},
     volume = {43},
     year = {1983},
     zbl = {0519.12005},
     url = {http://geodesic.mathdoc.fr/item/MM2_1983__43_154946/}
}