Investigation of the periodic solutions of nonlinear autonomous systems in the critical case by Korol', I. I., Король, І. І.

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On Periodic Solutions of One Class of Systems of Differential Equations by Korol', I. I., Король, І. І.

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Once again on the Samoilenko numerical-analytic method of successive periodic approximations by Korol', I. I., Perestyuk, N. A., Король, І. І., Перестюк, М. О.

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Investigation and solution of boundary-value problems with parameters by numerical-analytic method by Korol', I. I., Ronto, M. I., Король, И. И., Ронто, Н. И., Король, И. И., Ронто, Н. И.

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