“THE CAUCHY-GOURSAT PROBLEM FOR A HYPERBOLIC EQUATION OF THE SECOND KIND WITH A SINGULAR COEFFICIENT”. Journal of Multidisciplinary Sciences and Innovations 4, no. 11 (December 5, 2025): 222–225. Accessed February 23, 2026. https://www.ijmri.de/index.php/jmsi/article/view/3346.