KUMAR AGARWAL, Ajay; KUMAR, Rakesh. Directions of Production Planning & Production Control System: Mathematical Evolution from the Flexibility Point of View. Ecuadorian Science Journal, [S. l.], v. 4, n. 2, p. 17–24, 2020. DOI: 10.46480/esj.4.2.68. Disponível em: https://journals.gdeon.org/index.php/esj/article/view/68.. Acesso em: 5 oct. 2025.