@article{FPM_1998_4_3_a4,
     author = {A. R. Danilin and A. M. Il'in},
     title = {On the~structure of the~solution of a~perturbed optimal-time control problem},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {905--926},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1998_4_3_a4/}
}