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IEEE Transactions on Learning Technologies > 2012 > 5 > 3 > 199 - 212
IEEE Transactions on Software Engineering > 2011 > 37 > 3 > 325 - 340
IEEE Transactions on Learning Technologies > 2011 > 4 > 1 > 98 - 110
IEEE Transactions on Systems, Man, and Cybernetics, Part C (Applications... > 2011 > 41 > 3 > 284 - 296
IEEE Transactions on Education > 2011 > 54 > 1 > 114 - 124
2010 International Computer Symposium (ICS2010) > 983 - 987
2010 Second World Congress on Software Engineering > 2 > 45 - 52