@article{MM2_1989__64_2_155408,
     author = {Mikihito Hirabayashi and Ken-ichi Yoshino},
     title = {Remarks on unit indices of imaginary abelian number fields {II.}},
     journal = {Manuscripta mathematica},
     pages = {235--252},
     publisher = {mathdoc},
     volume = {64},
     number = {2},
     year = {1989},
     zbl = {0703.11054},
     url = {http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155408/}
}