@article{DAN_1992_324_1_a11,
     author = {V. S. Kozyakin and A. V. Pokrovskii},
     title = {The role of controllability-type properties in the study of the},
     journal = {Doklady Akademii Nauk},
     pages = {60--64},
     publisher = {mathdoc},
     volume = {324},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_324_1_a11/}
}