On Dirichlet problem for Beltrami equations in finitely domains за авторством I. Petkov, V. Ryazanov

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The level of the shadow economy in Ukraine and ways to combat it за авторством T. A. Kulakovska, O. I. Petkov

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Phenotypical characteristics of silkworm (Bombyx mori L.) lines genetically marked by sex and possibility of their use for commercial hybridization за авторством N. I. Petkov, J. S. Nacheva, G. X. Mladenov, L. Ignatova, M. E. Braslavskij, V. A. Golovko, M. I. Stotskij

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