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MSIE 2011 > 1122 - 1125
IEEE Transactions on Learning Technologies > 2011 > 4 > 2 > 138 - 148
IEEE Transactions on Education > 2011 > 54 > 1 > 164 - 167
IEEE Transactions on Education > 2011 > 54 > 2 > 222 - 228
IEEE Transactions on Education > 2011 > 54 > 1 > 149 - 155