%0 Journal Article %A E. K. Kostousova %T On the weak observability property for the one-dimensional wave equation with a point nonstationary observation operator %J Differencialʹnye uravneniâ %D 1991 %P 1318-1325 %V 27 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1991_27_8_a4/ %G ru %F DE_1991_27_8_a4