HEJNOVÁ, E. Tasks developing the skill of identification and control of variables. MATHEMATICS–PHYSICS–INFORMATICS, [S. l.], v. 30, n. 4, p. 287–298, 2021. Disponível em: https://mfi.upol.cz/index.php/mfi/article/view/563. Acesso em: 15 nov. 2026.