@article{DAN_1981_261_2_a9,
     author = {A. V. Lotov},
     title = {On the concept and construction of generalized accessibility sets for linear controllable systems described by partial differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {297--300},
     publisher = {mathdoc},
     volume = {261},
     number = {2},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_261_2_a9/}
}