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SAR-21 SA-21 GrowlerTài liệu tham khảo
WikiPedia: SAR-21 http://www.stengg.com/CoyCapPro/detail.aspx?pdid=1... http://www.youtube.com/watch?v=6B93C8o4_aQ http://www.youtube.com/watch?v=DRParGBfaXg http://world.guns.ru/assault/sing/st-kinetics-sar-... http://www.mindef.gov.sg/imindef/news_and_events/n... https://web.archive.org/web/20110716134556/http://...