ABDUKODIROV, A.T.; TULKINBOEV, T.A. Classification and reduction to canonical form of linear differential equations partial of the sixth-order with non-multiple characteristics. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 119, n. 3, p. 4–21, 2025. DOI: 10.31489/2025m3/4-21. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/841. Acesso em: 5 oct. 2025.