KAZMERCHUK, Anatolii. 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, [S. l.], n. 22(83), p. 61–66, 2026. DOI: 10.31471/2304-7399-2026-22(83)-61-66. Disponível em: https://www.pvntsh.nung.edu.ua/index.php/number/article/view/2241. Acesso em: 25 apr. 2026.