@article{MZM_2021_109_4_a0,
     author = {E. R. Avakov and G. G. Magaril-Il'yaev},
     title = {Implicit {Function.} {Controllability} and {Perturbation} of {Optimal} {Control} {Problems}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {483--499},
     publisher = {mathdoc},
     volume = {109},
     number = {4},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2021_109_4_a0/}
}