STAMM, Margrit. The rich get richer and the poor get poorer? Matthew effects and achievement differences in support programmes. Swiss Journal of Educational Research, Bern, v. 32, n. 3, p. 511–532, 2010. DOI: 10.24452/sjer.32.3.4846. Disponível em: https://sjer.ch/article/view/4846. Acesso em: 2 may. 2025.