YILDIRIM, O.; CAGLAK, S. On the Lie symmetries of the boundary value problems for differential and difference sine-Gordon equations. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 102, n. 2, p. 142–153, 2021. DOI: 10.31489/2021m2/142-153. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/427. Acesso em: 18 aug. 2025.