Oscillations of systems with impulsive action, with slowly varying parameters and with lag
English version (Springer): Ukrainian Mathematical Journal 28 (1976), no. 6, pp 633-638.
Citation Example: Nguien Kkhak Lan Oscillations of systems with impulsive action, with slowly varying parameters and with lag // Ukr. Mat. Zh. - 1976. - 28, № 6. - pp. 823–830.
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