【机 构】
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KolaBranchofGeophysicalSurveyofRussianAcademyofSciences,InstituteofEconomicsProblems
【基金项目】
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This research was supported by Russian Foundation of Basic Research (project Nu 13-05-00158) Russian Ministry of Science and Education (project Nu 2012-1.2.1-12-000-3002-007).