1. Academic tracking is related to gains in students' intelligence over four years: Evidence from a propensity score matching study. (February 2017) Authors: Guill, Karin; Lüdtke, Oliver; Köller, Olaf Journal: Learning and instruction Issue: Volume 47(2017:Feb.) Page Start: 43 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗