@article{DAN_1992_323_1_a5,
     author = {V. Ya. Yakubov},
     title = {Unboundedness of normalized vector functions of {Dirac-type}},
     journal = {Doklady Akademii Nauk},
     pages = {35--38},
     year = {1992},
     volume = {323},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_323_1_a5/}
}