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@article{DE_1973_9_5_a21, author = {V. P. Kirlitsa}, title = {Invariance of a certain linear system with lag}, journal = {Differencialʹnye uravneni\^a}, pages = {955--957}, publisher = {mathdoc}, volume = {9}, number = {5}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_5_a21/} }
V. P. Kirlitsa. Invariance of a certain linear system with lag. Differencialʹnye uravneniâ, Tome 9 (1973) no. 5, pp. 955-957. http://geodesic.mathdoc.fr/item/DE_1973_9_5_a21/