@article{DAN_1991_319_1_a2,
     author = {S. A. Vakhrameev},
     title = {The {Lyusternik--Shnirel'man} theory for transversally convex subsets of {Hilbert} manifolds and its application in optimal control theory},
     journal = {Doklady Akademii Nauk},
     pages = {18--21},
     publisher = {mathdoc},
     volume = {319},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_319_1_a2/}
}