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IEEE Transactions on Learning Technologies > 2010 > 3 > 3 > 265 - 271
IEEE Transactions on Instrumentation and Measurement > 2008 > 57 > 4 > 724 - 730
IEEE Transactions on Learning Technologies > 2010 > 3 > 3 > 265 - 271
IEEE Transactions on Instrumentation and Measurement > 2008 > 57 > 4 > 724 - 730