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WikiPedia: GLONASS http://www.gpssoft.ru/ http://www.glonass-ianc.rsa.ru/pls/htmldb/f?p=202:... http://www.cpv.org.vn/cpv/modules/news/newsdetail.... https://commons.wikimedia.org/wiki/Category:GLONAS... https://baodatviet.vn/khoa-hoc/cong-nghe/chuyen-gi...