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IEEE Access > 2017 > 5 > 480 - 500
IEEE Transactions on Learning Technologies > 2016 > 9 > 4 > 342 - 353
2010 IEEE Frontiers in Education Conference (FIE) > S1A-1 - S1A-2
IEEE Transactions on Professional Communication > 2008 > 51 > 3 > 302 - 312