TY - JOUR AU - V. G. Zadorozhniy AU - L. Yu. Kabantosva TI - On solution of first-order linear systems of partial differential equations JO - Contemporary Mathematics. Fundamental Directions PY - 2021 SP - 549 EP - 563 VL - 67 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMFD_2021_67_3_a9/ LA - ru ID - CMFD_2021_67_3_a9 ER -