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R-39 RifTài liệu tham khảo
WikiPedia: R-39_Rif http://www.astronautix.com/lvs/r39.htm http://thebulletin.metapress.com/content/t30830717... http://www.globalsecurity.org/wmd/world/russia/941... http://www.globalsecurity.org/wmd/world/russia/r39... http://www.globalsecurity.org/wmd/world/russia/r39... http://thebulletin.org