Kovalyov, Ivan Regularization of the indefinite Stieltjes moment problem. (English) Zbl 1439.30056 Linear Algebra Appl. 594, 1-28 (2020). Reviewer: Mihai Putinar (Santa Barbara) MSC: 30E05 15B57 46C20 93B28 PDFBibTeX XMLCite \textit{I. Kovalyov}, Linear Algebra Appl. 594, 1--28 (2020; Zbl 1439.30056) Full Text: DOI
Kovalyov, Ivan M. Shifted Darboux transformations of the generalized Jacobi matrices. I. (English. Ukrainian original) Zbl 1454.47039 J. Math. Sci., New York 242, No. 3, 393-412 (2019); translation from Ukr. Mat. Visn. 15, No. 4, 490-515 (2018). Reviewer: Leonid Golinskii (Kharkov) MSC: 47B36 15A23 42C05 PDFBibTeX XMLCite \textit{I. M. Kovalyov}, J. Math. Sci., New York 242, No. 3, 393--412 (2019; Zbl 1454.47039); translation from Ukr. Mat. Visn. 15, No. 4, 490--515 (2018) Full Text: DOI
Kovalyov, Ivan Darboux transformation of the Laguerre operator. (English) Zbl 1466.47029 Complex Anal. Oper. Theory 12, No. 3, 787-809 (2018). Reviewer: Małgorzata Michalska (Lublin) MSC: 47B90 42C05 15A23 PDFBibTeX XMLCite \textit{I. Kovalyov}, Complex Anal. Oper. Theory 12, No. 3, 787--809 (2018; Zbl 1466.47029) Full Text: DOI
Kovalyov, Ivan Mikhailovich Darboux transformation with parameter of generalized Jacobi matrices. (English. Russian original) Zbl 1370.15011 J. Math. Sci., New York 222, No. 6, 703-722 (2017); translation from Ukr. Mat. Visn. 13, No. 3, 298–323 (2016). Reviewer: Rabe von Randow (Bonn) MSC: 15A23 PDFBibTeX XMLCite \textit{I. M. Kovalyov}, J. Math. Sci., New York 222, No. 6, 703--722 (2017; Zbl 1370.15011); translation from Ukr. Mat. Visn. 13, No. 3, 298--323 (2016) Full Text: DOI