RAMM, Alexander G. Representation of vector fields. Global Journal of Mathematical Analysis, [S. l.], v. 3, n. 2, p. 73–76, 2015. DOI: 10.14419/gjma.v3i2.4577. Disponível em: https://sciencepubco.com/index.php/GJMA/article/view/4577.. Acesso em: 3 may. 2024.