TY - JOUR AU - D. D. Kiselev TI - Ultrasolvable covering of the group $Z_2$ by the groups $Z_8$, $Z_{16}$ and~$Q_8$ JO - Zapiski Nauchnykh Seminarov POMI PY - 2015 SP - 47 EP - 72 VL - 435 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ZNSL_2015_435_a3/ LA - ru ID - ZNSL_2015_435_a3 ER -