@article{DE_1995_31_12_a8,
     author = {L. Z. Fishman},
     title = {Criteria for unsafe and safe boundaries of the domain of stability of systems with delay in the case of two pairs of purely imaginary roots},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2020--2024},
     publisher = {mathdoc},
     volume = {31},
     number = {12},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_12_a8/}
}