MEJÍA ALEMÁN, C.; CORTEZ GUTIÉRREZ, M. M. .; TAIPE HUAMANÍ, E. L. A characterization of the natural isomorphism of bifunctors. Selecciones Matemáticas, [S. l.], v. 10, n. 02, p. 436 - 443, 2023. DOI: 10.17268/sel.mat.2023.02.15. Disponível em: https://revistas.unitru.edu.pe/index.php/SSMM/article/view/5616. Acesso em: 9 may. 2024.