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D’Mello, S. K., Strain, A. C., Olney, A., & Graesser, A. (2013). Affect, meta-affect, and affect regulation during complex learning. In R. Azevedo, & V. Aleven (Eds.), International handbook of metacognition and learning technologies, Vol. 26 of Springer International Handbooks of Education (pp. 669–681). Springer New York.