@article{DE_1971_7_2_a21,
     author = {E. M. Markushin},
     title = {The computation of quadratic functionals for systems with time lag},
     journal = {Differencialʹnye uravneni\^a},
     pages = {369--370},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_2_a21/}
}