References:
[1] |
R. Bellman, Stability Theory of Differential Equations, McGraw-Hill, New York (1953). · Zbl 0053.24705 |
[2] |
Z. B. Seidov, ?A boundary-value problem with a parameter for systems of second-order differential equations with a retarded argument,? Ukr. Mat. Zh.,26, No. 5, 671-677 (1974). · Zbl 0303.34057 |
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