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WikiPedia: Đạn_cao_su http://www.officer.com/web/online/Industry-Busines... http://www3.interscience.wiley.com/journal/1121903... //www.ncbi.nlm.nih.gov/pubmed/1148650 //dx.doi.org/10.1002%2Fbjs.1800620613 http://cain.ulst.ac.uk/othelem/chron/ch70.htm#Aug http://www.quarryhs.co.uk/baton.htm https://web.archive.org/web/20100429091933/http://... https://archive.today/20130106045139/http://www3.i...