@article{DAN_1992_322_1_a1,
     author = {I. V. Gaishun and Hoang Van Quang},
     title = {Solvability of a class of operator equations and controllability},
     journal = {Doklady Akademii Nauk},
     pages = {16--19},
     publisher = {mathdoc},
     volume = {322},
     number = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_322_1_a1/}
}