12 citations to https://www.mathnet.ru/rus/faa922
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Л. В. Рыжик, Е. И. Шульман, “Об алгебре симметрий нелинейных интегрируемых уравнений”, ТМФ, 95:1 (1993), 34–41 ; L. V. Ryzhik, E. I. Shulman, “Symmetry algebra of nonlinear integrable equations”, Theoret. and Math. Phys., 95:1 (1993), 387–392
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P. G. Grinevich, Springer Series in Nonlinear Dynamics, Nonlinear Processes in Physics, 1993, 108