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Fernandes E, Riva O, Nath S.  2015.  My OS Ought to Know Me Better: In-app Behavioural Analytics as an OS Service. 15th Workshop on Hot Topics in Operating Systems (HotOS XV).
Riva O, Qin C, Strauss K, Lymberopoulos D.  2012.  Progressive Authentication: Deciding When to Authenticate on Mobile Phones. 21st USENIX Security Symposium (USENIX Security 12). :301--316.