Optimal Control Model of University-PhD-Postdoc-Industry (UPPI) Migration and Unemployment. Contemporary Mathematics , [S. l.], v. 5, n. 2, p. 1871–1890, 2024. DOI: 10.37256/cm.5220242986. Disponível em: https://ojs353.mebyme.cn/index.php/CM/article/view/2986. Acesso em: 24 dec. 2025.