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Group classification of quasilinear elliptic-type equations. II. Invariance under solvable Lie algebras von Lagno, V. I., Spichak, S. V., Лагно, В. I., Спічак, С. В.

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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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