Yakubovich V.A.,  Starzhinskiy V.M. Lineynye differentsialnye uravneniya s periodicheskimi koeffitsientami i ikh prilozheniya./Yakubovich V.A.,  Starzhinsky V.M. Linear differential equations with periodic coefficients and their applications. In Russian - landofmagazines.com

TransliterationYakubovich V.A., Starzhinskiy V.M. Lineynye differentsialnye uravneniya s periodicheskimi koeffitsientami i ikh prilozheniya.

In EnglishYakubovich V.A., Starzhinsky V.M. Linear differential equations with periodic coefficients and their applications. In Russian

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