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References:
[1] Nam P. BHATIA V. LAKSHMIKANTHAM: An extension of Lyapunov's direct method. Michigan Math. J. 12 (1965), 183-191. MR 0179421
[2] O. HÁJEK: Flows and periodic motions. CMUC 6, 2 (1965), 165-178. MR 0195079
[3] Taro YOSHIZAWA: Stability of sets and perturbed system. Funkcialaj Ekvacioj 5 (1962), 31-69. MR 0162021
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