?url_ver=Z39.88-2004&rft_id=10.1109%2FEMBC.2018.8512501&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aulast=Ung&rft.aufirst=W.C.&rft.au=Ung%2C+W.C.&rft.isbn=9781538636466&rft.title=Optimizing+Mental+Workload+by+Functional+Near-Infrared+Spectroscopy+Based+Dynamic+Difficulty+Adjustment&rft.date=2018&rft.issn=1557170X&rft.genre=proceeding