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Paas, Fred G. W. C.; Van Merriënboer, Jeroen J. G. The Efficiency of Instructional Conditions: An Approach to Combine Mental Effort and Performance Measures. Human Factors: The Journal of the Human Factors and Ergonomics Society. 23 November 2016, 35 (4): 737–743. S2CID 67201799. doi:10.1177/001872089303500412.