@article{AA_2015_27_6_a13,
     author = {A. V. Yakovlev},
     title = {Ultrasolvable embedding problem for number fields},
     journal = {Algebra i analiz},
     pages = {260--263},
     publisher = {mathdoc},
     volume = {27},
     number = {6},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2015_27_6_a13/}
}