@article{MZM_2005_77_4_a0,
     author = {A. V. Arutyunov},
     title = {Covering of nonlinear maps on a cone in neighborhoods of irregular points},
     journal = {Matemati\v{c}eskie zametki},
     pages = {483--497},
     publisher = {mathdoc},
     volume = {77},
     number = {4},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_77_4_a0/}
}