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