@article{10_1017_S0017089500032353,
     author = {III, Frank Gerth},
     title = {On 2-class field towers for quadratic number fields with 2-class group of type (2,2)},
     journal = {Glasgow mathematical journal},
     pages = {63--69},
     year = {1998},
     volume = {40},
     number = {1},
     doi = {10.1017/S0017089500032353},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500032353/}
}