?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Kieu%2C+Thanh+Binh&rft.aulast=Kieu&rft.aufirst=Thanh+Binh&rft.date=11+October+2019&rft.title=A+Submodular+Approach+for+Reference+Recommendation&rft.genre=proceeding