Korol’, I. I.; Semchyshyn, R. Ya. Investigation of periodic solutions of degenerate nonlinear systems of differential equations in a critical case. (Ukrainian. English summary) Zbl 1289.34110 Nauk. Visn. Chernivets’kogo Univ., Mat. 2, No. 2-3, 102-107 (2012). MSC: 34C25 34A45 PDFBibTeX XMLCite \textit{I. I. Korol'} and \textit{R. Ya. Semchyshyn}, Nauk. Visn. Chernivets'kogo Univ., Mat. 2, No. 2--3, 102--107 (2012; Zbl 1289.34110)
Korol’, I. I. A new approach to integration of two-point boundary value problems. (Ukrainian. English summary) Zbl 1064.65523 Nauk. Visn. Chernivets’kogo Univ., Mat. 228, 36-41 (2004). MSC: 65L10 34B15 PDFBibTeX XMLCite \textit{I. I. Korol'}, Nauk. Visn. Chernivets'kogo Univ., Mat. 228, 36--41 (2004; Zbl 1064.65523)
Korol’, I. I. On an approach to investigate boundary value problems with parameters. (Ukrainian. English summary) Zbl 1122.34304 Nauk. Visn. Uzhgorod. Univ., Ser. Mat. 8, 70-78 (2003). MSC: 34B08 34B10 34A45 PDFBibTeX XMLCite \textit{I. I. Korol'}, Nauk. Visn. Uzhgorod. Univ., Ser. Mat. 8, 70--78 (2003; Zbl 1122.34304)
Korol’, I. I. Application of a numerical-analytic method for studying a three-point boundary value problem with parameters. (Ukrainian. English summary) Zbl 0979.34005 Nauk. Visn. Uzhgorod. Univ., Ser. Mat. 3, 124-127 (1998). Reviewer: A.D.Borisenko (Kyïv) MSC: 34A45 34B10 PDFBibTeX XMLCite \textit{I. I. Korol'}, Nauk. Visn. Uzhgorod. Univ., Ser. Mat. 3, 124--127 (1998; Zbl 0979.34005)