?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Nguyen%2C+Minh+Trang&rft.aulast=Nguyen&rft.aufirst=Minh+Trang&rft.date=25+January+2019&rft.isbn=978-1-4503-6612-0+doi%3E10.1145%2F3310986.3310999&rft.title=QASA%3A+Advanced+Document+Retriever+for+Open-Domain+Question+Answering+by+Learning+to+Rank+Question-Aware+Self-Attentive+Document+Representations&rft.tpages=5&rft.genre=proceeding