@article{IVM_1978_10_a9,
     author = {K. A. Pupkov and E. B. Frolov},
     title = {An attainability property for nonlinear systems on {manifolds.~I}},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {61--71},
     publisher = {mathdoc},
     number = {10},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1978_10_a9/}
}