Double integrals in the calculation of fluid flow density in a vector field. Revista Torreón Universitario, [S. l.], v. 13, n. 38, p. 27–41, 2024. DOI: 10.5377/rtu.v13i38.19126. Disponível em: https://revistas.unan.edu.ni/index.php/Torreon/article/view/4726. Acesso em: 6 aug. 2025.