SÖNNERHED, W. W. Quadratic equations in Swedish textbooks for upper-secondary school. LUMAT: International Journal on Math, Science and Technology Education, [S. l.], v. 9, n. 1, p. 518–545, 2021. DOI: 10.31129/LUMAT.9.1.1473. Disponível em: https://journals.helsinki.fi/lumat/article/view/1473. Acesso em: 8 may. 2024.