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IEEE Transactions on Education > 2011 > 54 > 2 > 216 - 221
IEEE Transactions on Learning Technologies > 2011 > 4 > 2 > 175 - 186
IEEE Transactions on Education > 2011 > 54 > 2 > 294 - 301
2010 International Computer Symposium (ICS2010) > 348 - 353