OPATOVÁ, Michala; HYBELBAUEROVÁ, Simona. The Experiments with Natural Compounds in Secondary School Chemistry Education – Opinions of Secondary School Teachers. Scientia in educatione, [S. l.], v. 4, n. 2, p. 52–64, 2020. DOI: 10.14712/18047106.71. Disponível em: https://medusa.is.cuni.cz/scied/article/view/71. Acesso em: 4 jul. 2025.