ZYRIANOVA, Nadezda. Academic achievement of twins and their single-born peers. Part 2 . Psychological Studies, [S. l.], v. 2, n. 7, 2009. DOI: 10.54359/ps.v2i7.963. Disponível em: https://psystudy.ru/num/article/view/963. Acesso em: 12 nov. 2026.