@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},
     year = {1977},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1977_12_a3/}
}