For citations:

Rudzko J.V. Classical solution to the first mixed problem for a mildly quasilinear wave equation: a fixed-point approach. Proceedings of the Institute of Mathematics of the NAS of Belarus. 2026;34(1):85-95. https://doi.org/10.67268/1812-5093-2026-34-1-85-95. EDN: DCQCNW