[1]
N. Ibragimov, M. Torrisi, and R. T. 'a, “Some Results About Self-Adjointness of a Class of Nonlinear Wave Equations”, JVTSD, vol. 5, no. 3, pp. 279–283, Aug. 2026, doi: 10.5890/JVTSD.2021.09.008.