@article{MZM_1987_41_2_a10,
     author = {N. M. Isakov},
     title = {Theorems on the smoothness of the right inverse},
     journal = {Matemati\v{c}eskie zametki},
     pages = {216--226},
     year = {1987},
     volume = {41},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_2_a10/}
}