On conservation of a valuable meadow-steppe habitats on chalk outcrops of the Desna plateau (Suma region, Ukraine) von L. V. Koval

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New floristic records of alien species of vascular plants in the Desna plateau area (Sumy region, Ukraine) von L. V. Koval

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The taxonomic analysis of the flora of the Desna Plato (Sumy Region, Ukraine) von L. V. Koval

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Nonlinear cyclic transport phenomena in copper point contacts von G. V. Kamarchuk, A. P. Pospelov, A. V. Savitskij, L. V. Koval

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