@article{DE_1992_28_3_a30,
     author = {E. K. Kostousova},
     title = {On observability for the one-dimensional heat equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {543--545},
     publisher = {mathdoc},
     volume = {28},
     number = {3},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_3_a30/}
}