Intensive Math Instruction and Educational Attainment: Long-Run Impacts of Double-Dose Algebra (with the PNAS 12-year follow-up) - Cortes, K. E.; Goodman, J. S.; Nomi; T. (2015); Nomi, T.; Raudenbush, S. W.; Smith; J. J. (2021; PNAS) (2015)
natural-experiment; evidence grade B