@article{ZNSL_1981_113_a2,
     author = {V. I. Vasyunin and N. K. Nikol'skii},
     title = {Control subspaces of minimal dimension. {Elementary} introduction. {Discotheca}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {41--75},
     publisher = {mathdoc},
     volume = {113},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_113_a2/}
}