Tài liệu tham khảo WikiPedia: Nguyễn_Sum //doi.org/10.1007%2F978-981-13-5742-8_14 //doi.org/10.1007%2Fs40306-016-0190-z //doi.org/10.1016%2Fj.aim.2015.01.010 //doi.org/10.1016%2Fj.crma.2015.09.002 //www.worldcat.org/issn/0001-8708 //www.worldcat.org/issn/0251-4184 //www.worldcat.org/issn/1631-073X //www.worldcat.org/issn/2297-0215 http://cpd.vn/Default.aspx?tabid=692&Doctorid=2875 http://luanan.nlv.gov.vn/luanan?a=d&d=TTkFvmmrcptC...
