KAL’MENOV, T.Sh.; AREPOVA, G.D. A criterion for the existence of soliton solutions of telegraph equation. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 91, n. 3, p. 45–52, 2018. DOI: 10.31489/2018m3/45-52. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/240. Acesso em: 10 jul. 2025.