THE CAUCHY-GOURSAT PROBLEM FOR A HYPERBOLIC EQUATION OF THE SECOND KIND WITH A SINGULAR COEFFICIENT. Journal of Multidisciplinary Sciences and Innovations, [S. l.], v. 4, n. 11, p. 222–225, 2025. DOI: 10.55640/. Disponível em: https://www.ijmri.de/index.php/jmsi/article/view/3346. Acesso em: 23 feb. 2026.