HEFTER, S. L.; GONCHARUK, A. B. Linear differential equation with inhomogeneity in the form of a formal power series over a ring with non-Archimedean valuation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 74, n. 11, p. 1463–1477, 2022. DOI: 10.37863/umzh.v74i11.7287. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7287. Acesso em: 7 apr. 2025.