@article{TIMM_1992_1_a9,
     author = {A. B. Kurzhanskii and I. F. Sivergina},
     title = {The $\varepsilon$-observability property for distributed-parameter systems},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {122--137},
     publisher = {mathdoc},
     volume = {1},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_1992_1_a9/}
}