@article{10_4064_aa_76_2_145_147,
     author = {David Folk},
     title = {When are global units norms of units?},
     journal = {Acta Arithmetica},
     pages = {145--147},
     year = {1996},
     volume = {76},
     number = {2},
     doi = {10.4064/aa-76-2-145-147},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-76-2-145-147/}
}