Shifted Darboux transformations of the generalized Jacobi matrices, I by I. M. Kovalyov

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A truncated indefinite Stieltjes moment problem by I. M. Kovalyov

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Tunguska explosion and the Earth's magnetic field by M. Kovalyov, N. Kovalyov, S. Kovalyov

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An operator approach to indefinite Stieltjes moment problem by V. A. Derkach, I. M. Kovalyov

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Biologically active compounds from the rhizomes of Iris hungarica by O. O. Mykhailenko, V. M. Kovalyov, S. V. Kovalyov, A. V. Krechun

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