Problems of the theory of invariants and Lie algebras applied in the qualitative theory of differential systems by Mihail Popa

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On stability of some examples of ternary differential critical systems with quadratic nonlinearities by Natalia Neagu, Mihail Popa

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Professor Alexandru Șubă on his 70th birthday by Dumitru Cozma, Mihail Popa

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Stabilitatea după Lyapunov a mișcării neperturbate guvernatede sistemul diferențial by Natalia Neagu, Mihail Popa

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ASUPRA UNUI CAZ DE STABILITATE A MIȘCĂRII NEPERTURBATE GUVERNATE DE SISTEMUL CRITIC DIFERENȚIAL TERNAR CU NELINIARITĂȚI PĂTRATICE by Natalia NEAGU, Mihail POPA

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Stability of unperturbed motion governed by the ternary differential system of Lyapunov-Darboux type with nonlinearities of degree four by Natalia Neagu, Mihail Popa, Victor Orlov

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