E. Kenenbaev, G. Kenenbaeva, G. Abakirova, and F. Nazarbaev, “Functional Relations as a Tool for Analysing Differential Equations”, J. Sci. Math. Lett., vol. 13, no. 2, pp. 72–86, Oct. 2025, doi: 10.37134/jsml.vol13.2.6.2025.