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

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The level of the shadow economy in Ukraine and ways to combat it von 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 von N. I. Petkov, J. S. Nacheva, G. X. Mladenov, L. Ignatova, M. E. Braslavskij, V. A. Golovko, M. I. Stotskij

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