@article{SM_2023_214_4_a0,
     author = {A. A. Zlotnik and B. N. Chetverushkin},
     title = {Properties and errors of second-order parabolic and hyperbolic perturbations of a~first-order symmetric hyperbolic system},
     journal = {Sbornik. Mathematics},
     pages = {444--478},
     publisher = {mathdoc},
     volume = {214},
     number = {4},
     year = {2023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2023_214_4_a0/}
}