@article{JTNB_1997__9_2_405_0,
     author = {Yamamura, Ken},
     title = {Maximal unramified extensions of imaginary quadratic number fields of small conductors},
     journal = {Journal de th\'eorie des nombres de Bordeaux},
     pages = {405--448},
     publisher = {Universit\'e Bordeaux I},
     volume = {9},
     number = {2},
     year = {1997},
     mrnumber = {1617407},
     zbl = {0905.11048},
     language = {en},
     url = {http://www.numdam.org/item/JTNB_1997__9_2_405_0/}
}