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A COMPARATIVE ANALYSIS OF THE ACCURACY ATTAINABLE FOR THE LOCAL MONITORING OF EARTH’S SURFACE MOVEMENTS AND DEFORMATION USING THE GPS AND GLONASS NAVIGATION SATELLITE SYSTEMS Article Kaftan V.I., Sidorov V.A., Ustinov A.V. Journal of Volcanology and Seismology. Maik Nauka-Interperiodica Publishing. Vol. 11. 2017. P. 217-224