@article{DE_2006_42_1_a12,
     author = {Yu. K. Sabitova},
     title = {On the smoothness of the solution of the boundary control problem at two endpoints for the string equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {132--134},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_1_a12/}
}