%0 Journal Article %A Yu. K. Sabitova %T On the smoothness of the solution of the boundary control problem at two endpoints for the string equation %J Differencialʹnye uravneniâ %D 2006 %P 132-134 %V 42 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2006_42_1_a12/ %G ru %F DE_2006_42_1_a12