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] Secular variations of sunspot magnetic fields: the comparison of various indexes. Kosm. nauka tehnol. 2010 ;16(4):30-36.
Results of the investigation of fast magnetic field oscillations in a sunspot on the basis of simultaneous measurements in the Kyiv and Crimea observatories. Kosm. nauka tehnol. 2007 ;13(Supplement1):101-104 .