@article{DE_2006_42_8_a16,
     author = {Yu. K. Sabitova},
     title = {On the smoothness of the solution of the two-endpoint boundary control problem for the string equation on an arbitrary time interval},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1140--1142},
     publisher = {mathdoc},
     volume = {42},
     number = {8},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_8_a16/}
}