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References
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| 1. |
Sobolev S. L., “Functionally invariant solutions to the wave equations”, Trudy Math. Inst. Steklov, 5, 1934, 259–264 |
| 2. |
Pommaret J. F., Systems of Partial Differential equations and Lie Pseudogroups, Gordon and Breach, N. Y., 1978, 398 pp. |
| 3. |
Finikov S. P., The Method of Cartan's Exterior Forms, Gostehizdat, M.–L., 1948, 432 pp. |
| 4. |
Sidorov A. F., Shapeev V. P., Yanenko N. N., The Method of Differential Relations and its Applications in Gas Dynamics, Izdatel'stvo Nauka, Novosibirsk, 1984, 272 pp. |