@article{10_4064_aa_20_4_331_344,
     author = {Joseph Liang},
     title = {On relations between units of normal algebraic number fields and their subfields},
     journal = {Acta Arithmetica},
     pages = {331--344},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {1972},
     doi = {10.4064/aa-20-4-331-344},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-20-4-331-344/}
}