BARAN, Hynek. Infinitely many commuting nonlocal symmetries for modified Martínez Alonso-Shabat equation.
Communications in Nonlinear Science and Numerical Simulation. Amsterdam: Elsevier B.V., vol. 96, may, p. "105692-1"-"105692-4", 4 pp. ISSN 1007-5704. doi:10.1016/j.cnsns.2021.105692. 2021.