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WikiPedia: Tàu_ngầm_Proyekta_633 http://www.russianwarrior.com/STMMain.htm?1947vehi... http://www.sinodefence.com/navy/sub/type033romeo.a... http://www.sinodefence.com/navy/sub/type035ming.as... http://russian-ships.info/eng/submarines/project_6... http://www.globalsecurity.org/military/world/china... http://www.globalsecurity.org/military/world/china... http://www.globalsecurity.org/military/world/china...