@article{DE_1999_35_11_a10,
     author = {V. A. Il'in},
     title = {A wave equation with a bounded control on two ends for an arbitrary time interval},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1517--1534},
     publisher = {mathdoc},
     volume = {35},
     number = {11},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_11_a10/}
}