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@article{IVM_1977_12_a3, author = {A. I. Ivachev}, title = {Countable systems of differential equations with time lags}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {19--22}, publisher = {mathdoc}, number = {12}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1977_12_a3/} }
A. I. Ivachev. Countable systems of differential equations with time lags. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 12 (1977), pp. 19-22. http://geodesic.mathdoc.fr/item/IVM_1977_12_a3/