@article{10_4064_aa114_1_5,
     author = {Humio Ichimura},
     title = {Normal integral bases and ray class groups},
     journal = {Acta Arithmetica},
     pages = {71--85},
     year = {2004},
     volume = {114},
     number = {1},
     doi = {10.4064/aa114-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa114-1-5/}
}