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IEEE Transactions on Learning Technologies > 2015 > 8 > 2 > 158 - 172
IEEE Latin America Transactions > 2015 > 13 > 4 > 1205 - 1209
TENCON 2011 - 2011 IEEE Region 10 Conference > 201 - 205
2010 International Conference on Electronics and Information Engineering > 1 > V1-476 - V1-481