@article{CMFD_2021_67_3_a9,
     author = {V. G. Zadorozhniy and L. Yu. Kabantosva},
     title = {On solution of first-order linear systems of partial differential equations},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {549--563},
     publisher = {mathdoc},
     volume = {67},
     number = {3},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2021_67_3_a9/}
}