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- ^ Basu, Kanad; Hussain, Suha Sabi; Gupta, Ujjwal; Karri, Ramesh (2020). "COPPTCHA: COPPA Tracking by Checking Hardware-Level Activity". IEEE Transactions on Information Forensics and Security. 15: 3213–3226. doi:10.1109/TIFS.2020.2983287. ISSN 1556-6021.