Kazmerchuk, A. 2026. Approximation by parabolic systems of partial differential equations of higher order systems of quasilinear partial differential equations of the first order. PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY. Number. 22(83) (Apr. 2026), 61–66. DOI:https://doi.org/10.31471/2304-7399-2026-22(83)-61-66.