POGONOWSKI, J. Remarks on the Principle of Permanence of Forms. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia, [S. l.], v. 11, p. 127–141, 2019. DOI: 10.24917/20809751.11.7. Disponível em: https://didacticammath.uken.krakow.pl/article/view/6906. Acesso em: 29 apr. 2024.