%0 Journal Article %A D. D. Kiselev %T Ultrasolvable covering of the group $Z_2$ by the groups $Z_8$, $Z_{16}$ and~$Q_8$ %J Zapiski Nauchnykh Seminarov POMI %D 2015 %P 47-72 %V 435 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2015_435_a3/ %G ru %F ZNSL_2015_435_a3