@article{IIMI_2006_3_a14,
     author = {Yu. F. Dolgii},
     title = {Construction of the approached characteristic equations for time-invariant systems of differential equations with aftereffect},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {33--34},
     year = {2006},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2006_3_a14/}
}