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References
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| 2. |
V. V. Rumyantsev, A. S. Oziraner, Stability and stabilization of motion with respect to a part of the variables, Nauka, Moscow, 1987, 256 pp. (In Russ.) |
| 3. |
V. P. Prokopyev, “On stability with respect to some of the variables in the critical case of a single zero root.”, Journal of Applied Mathematics and Mechanics, 39 (1975), 422-426 (In Russ.)  |
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V. I. Vorotnikov, Stability of dynamical systems with respect to a part of variables, Nauka, Moscow, 1991, 288 pp. (In Russ.) |
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V. I. Vorotnikov, “On the stability of dynamical systems with respect to a part of variables”, Journal of Applied Mathematics and Mechanics, 43 (1979), 441-450 (In Russ.) |
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P. Olver, Applications of Lie groups to differential equations, Mir, Moscow, 1989, 639 pp. (In Russ.) |
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U. A. Mitropolsky, A. K.Lopatin, The group-theoretical approach in asymptotic methods of nonlinear mechanics, Naukova dumka, Kiev, 1987, 270 pp. (In Ukr.) |
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V. I. Ovsjannikov, Group analysis of differential equations, Nauka, Moscow, 1978, 399 pp. (In Russ.) |
