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Schalk, L., Edelsbrunner, P. A., Deiglmayr, A., Schumacher, R., & Stern, E. (2019). improved application of the control-of-variables strategy as a collateral benefit of inquiry-based physics education in elementary school. Learning and instruction, 59, 34–45. http://access.bl.uk/ark:/81055/vdc_100071728820.0x00002f