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Ability-tracking, instructional time, and better pedagogy: ..:

Cortes, Kalena E ; Goodman, Joshua S
The American economic review.  104 (2014)  5 - p. 400-405 , 2014
Link: https://doi.org/10.1257/aer.104.5.400
Exemplar:  Zentrale:E02 z vwl 001 jc/649; Zentrale:Magazin Zs fc 1649