@article{TM_1990_183_a13,
     author = {V. V. Ishkhanov},
     title = {An embedding problem with a~nonabelian kernel of order $p^4$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {116--121},
     year = {1990},
     volume = {183},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1990_183_a13/}
}