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WikiPedia: Dram_(đơn_vị) http://www.apothecariesweights.com/ http://www.merriam-webster.com/medical/fluidram http://www.oed.com/view/Entry/57373 http://www.oed.com/view/Entry/57471 http://physics.nist.gov/Pubs/SP447/app8.pdf http://hdl.handle.net/2027/mdp.39015069402942 http://hdl.handle.net/2027/mdp.39015069402942?urla... http://www.worldcat.org/issn/0271-4027 //www.worldcat.org/oclc/181600928 //www.worldcat.org/oclc/44475779