A V Mikhailov, V S Novikov, “Perturbative symmetry approach”, J. Phys. A: Math. Gen., 35, № 22, 2002, 4775
Antonio Moro, Reference Module in Materials Science and Materials Engineering, 2024
Nitin Serwa, “Master symmetries of non-linear systems”, Phys. Scr., 99, № 6, 2024, 065037
A. Sergyeyev, “Locality of Symmetries Generated by Nonhereditary, Inhomogeneous, and Time-Dependent Recursion Operators: A New Application for Formal Symmetries”, Acta Applicandae Mathematicae, 83, № 1-2, 2004, 95
Ismagil Talgatovich Habibullin, Aigul Rinatovna Khakimova, “Nonlinear integrable lattices with three independent variables”, Ufimsk. Mat. Zh., 17, № 2, 2025, 105
V. É. Adler, A. B. Shabat, R. I. Yamilov, “Symmetry Approach to the Integrability Problem”, Theoretical and Mathematical Physics, 125, № 3, 2000, 1603