?url_ver=Z39.88-2004&rft_id=10.3389%2Ffpsyg.2015.01921&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aulast=Babiker&rft.au=Babiker%2C+A.&rft.aufirst=A.&rft.issue=DEC&rft.volume=6&rft.issn=16641078&rft.atitle=Machine+learning+to+differentiate+between+positive+and+negative+emotions+using+pupil+diameter&rft.title=Frontiers+in+Psychology&rft.date=2015&rft.genre=article