Theory of Linear Hahn difference equations. JOURNAL OF ADVANCES IN MATHEMATICS, [S. l.], v. 4, n. 2, p. 441–461, 2013. DOI: 10.24297/jam.v4i2.2496. Disponível em: https://rajpub.com/index.php/jam/article/view/2496. Acesso em: 7 apr. 2025.