STERNER, H. E. K. Teachers as actors in an educational design research: What is behind the generalized formula?. LUMAT: International Journal on Math, Science and Technology Education, [S. l.], v. 7, n. 3, p. 6–27, 2019. DOI: 10.31129/LUMAT.7.3.403. Disponível em: https://journals.helsinki.fi/lumat/article/view/1242. Acesso em: 21 jan. 2022.