International seminar of European group in automation of libraries (June, 6 - 8, 2001, Prague, Check Republic) von I. Levchenko

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Formation of social demand for the public Association of scientists in the period of development of capitalism von I. Levchenko

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Natural Science members, physical-chemical and mathematical society of Kharkiv von I. Levchenko

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Congresses of naturalists and physicians, as an effective means of educational and promotional work in the second half of XIX – early XX century von I. Levchenko

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The Analysis of Existing Methods of Solid Fuel Heat Treatment in Pre-Combustors (Review) von M. M. Jurchenko, A. I. Topal, N. I. Levchenko

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