@article{ZNSL_2015_435_a3,
     author = {D. D. Kiselev},
     title = {Ultrasolvable covering of the group $Z_2$ by the groups $Z_8$, $Z_{16}$ and~$Q_8$},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {47--72},
     publisher = {mathdoc},
     volume = {435},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2015_435_a3/}
}