?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Hoang%2C+Van+Xiem&rft.aulast=Hoang&rft.aufirst=Van+Xiem&rft.issue=1&rft.volume=35&rft.date=2019&rft.issn=0866-8612&rft.atitle=Cooperative+Caching+in+Two-Layer+Hierarchical+Cache+aided+Systems&rft.title=VNU+Journal+of+Computer+Science+and+Communication+Engineering&rft.pages=1-9&rft.genre=article