@article{DE_1976_12_8_a7,
     author = {A. B. Kurzhanskii and I. Ya. Pishchulina},
     title = {Minimax filtering under quadratic {constraints.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1434--1446},
     year = {1976},
     volume = {12},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_8_a7/}
}