@article{JTNB_2001__13_2_633_0,
     author = {Yamamura, Ken},
     title = {Maximal unramified extensions of imaginary quadratic number fields of small conductors, {II}},
     journal = {Journal de th\'eorie des nombres de Bordeaux},
     pages = {633--649},
     publisher = {Universit\'e Bordeaux I},
     volume = {13},
     number = {2},
     year = {2001},
     mrnumber = {1879676},
     zbl = {1013.11076},
     language = {en},
     url = {http://www.numdam.org/item/JTNB_2001__13_2_633_0/}
}