KOT, Marina G. Asymptotics of the eigenvalues of approximating differential equations with d-different coefficients. Journal of the Belarusian State University. Mathematics and Informatics, [S. l.], n. 1, p. 4–10, 2017. Disponível em: https://journals.bsu.by/index.php/mathematics/article/view/730. Acesso em: 18 jul. 2026.