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Aleven, V., McLaren, B.M., Sewall, J., van Velsen, M., Popescu, O., Demi, S., Ringenberg, M. & Koedinger, K.R. (2016). Example-Tracing Tutors: Intelligent Tutor Development for Non-Programmers. International Journal of Artificial Intelligence in Education, 26(1), 224-269.