TY - JOUR AU - Yu. F. Dolgii TI - Construction of the approached characteristic equations for time-invariant systems of differential equations with aftereffect JO - Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta PY - 2006 SP - 33 EP - 34 VL - 37 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IIMI_2006_37_3_a14/ LA - ru ID - IIMI_2006_37_3_a14 ER -