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@article{IVM_1967_1_a13, author = {V. P. Prokop'ev}, title = {Stability in the critical case of $r$ null-roots for a~system with aftereffect}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {88--94}, publisher = {mathdoc}, number = {1}, year = {1967}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1967_1_a13/} }
V. P. Prokop'ev. Stability in the critical case of $r$ null-roots for a~system with aftereffect. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1967), pp. 88-94. http://geodesic.mathdoc.fr/item/IVM_1967_1_a13/