Group Classification of the General Evolution Equation: Local and Quasilocal Symmetries von Zhdanov, R., Lahno, V.

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Reduction of the self-dual Yang-Mills equations. I. The Poincaré group von Zhdanov, R.Z., Lahno, V.I., Fushchych, W.I.

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Group classification of quasilinear elliptic-type equations. I. Invariance with respect to Lie algebras with nontrivial Levi decomposition von Lahno, V. I., Spichak, S. V., Лато, В. І., Спічак, С. В.

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