?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Du%2C+Phuong+Hanh&rft.aulast=Du&rft.aufirst=Phuong+Hanh&rft.date=2015&rft.issn=0866-8612&rft.atitle=Tr%E1%BB%B1c+quan+ho%C3%A1+d%E1%BB%AF+li%E1%BB%87u+l%E1%BB%9Bn+trong+%E1%BB%A9ng+d%E1%BB%A5ng+gi%C3%A1m+s%C3%A1t+v%C3%A0+%C4%91i%E1%BB%81u+khi%E1%BB%83n+t%E1%BA%ADp+trung&rft.title=VNU+Journal+of+Science&rft.genre=article