%0 Journal Article %A Yu. K. Sabitova %T On the smoothness of the solution of the two-endpoint boundary control problem for the string equation on an arbitrary time interval %J Differencialʹnye uravneniâ %D 2006 %P 1140-1142 %V 42 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2006_42_8_a16/ %G ru %F DE_2006_42_8_a16