BREW, L.; ACQUAH, J.; AMEGBEY, N. Extension of 2-Dimensional Planar Systems from Homological Algebra Perspective. American Scientific Research Journal for Engineering, Technology, and Sciences, [S. l.], v. 38, n. 1, p. 112–117, 2017. Disponível em: https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/3607. Acesso em: 2 may. 2024.