ARTICLE Sizov_IEEETIFS_2015/IDIAP Joint Speaker Verification and Anti-Spoofing in the i-Vector Space Sizov, Aleksandr Khoury, Elie Kinnunen, Tomi Wu, Zhizheng Marcel, Sébastien EXTERNAL http://publications.idiap.ch/attachments/papers/2015/Sizov_IEEETIFS_2015.pdf PUBLIC IEEE Transactions on Information Forensics and Security 10 4 821-832 2015 10.1109/TIFS.2015.2407362 doi