Algebraic topology: On results of quotient for topography modules. Periodicals of Engineering and Natural Sciences, [S. l.], v. 9, n. 3, p. 532–537, 2021. DOI: 10.21533/pen.v9.i3.868. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/868. Acesso em: 13 jun. 2026.