I R Sunagatova, A M Subkhangulova, M N Semenova, D I Borisov, A S Semenov, S V Dmitriev, “Properties of one-dimensional nonlinear vibrational modes in triangular lattice with Lennard-Jones interactions”, IOP Conf. Ser.: Mater. Sci. Eng., 1008:1 (2020), 012073
George Chechin, Denis Ryabov, “Introduction to the theory of bushes of nonlinear normal modes for studying large-amplitude atomic vibrations in systems with discrete symmetry”, Lett. Mater., 10:4 (2020), 523