TY - JOUR AU - Yu. F. Dolgii TI - The construction of the characteristic equation for a~system of differential equations with lag JO - Izvestiâ vysših učebnyh zavedenij. Matematika PY - 1977 SP - 9 EP - 19 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/IVM_1977_3_a1/ LA - ru ID - IVM_1977_3_a1 ER -